I disagree. The better way to handle this is to just put those cars in a simple 'Vintage class'.
After that,
PD should bring back GT5's simple (and underrated) method of restricting cars so we can race cars from the correct periods, and correct classes together. (In your case, 'Le Mans Prototype - 1954')
The current N.--- and Gr.- class system isn't meant to be specific enough to have a new class made for different eras. If you do that for too many eras and subclasses, eventually we are going to start getting into the realm of having 20-30 classes in the game (combined with what we have already), and that's just going to be really messy.
I think you're trying to say something that I agree with. I think the current class system (which originated in GT Sport) is largely fine, but we need more events - both in the campaign and online - that restricts the eligible cars to a subset within each class, such as the Sport Mode Daily Races that limited players to using the Group C racers within Gr.1. That said, I'm not sure if the 1954 Le Mans cars, the late 1960s prototypes, and the 1960s grand tourers can all be placed in a catch-all "vintage" class. Indeed, I recall hearing Kaz mention that each class is roughly based on the general pace they set, with BoP mostly touching things up just a tiny bit.
I do notice that for any given car in GT Sport that's affected by BoP, it's mostly by a very tiny amount, and not necessarily to make sure all cars within a group have the same power, or weight. See Gr.1 for a notable example of this. It's as if PD wants to preserve as much character as possible for each car, even after BoP affects it. So I suppose we'd have to see what sort of times PD gathers from these vintage racers that went to Le Mans, and see if it's worth creating a new group, or two, or even three.
As for that vintage Indy racer that won at Pebble Beach, I don't think it's likely it'll get any friends to race with, and I foresee it being reserved essentially for one-makes in Gr.X. Though if it was able to race with something else in a group, I certainly wouldn't mind.
But back to my main point, I think that if the Aston Martin DB3S, the Shelby Daytona Coupe, and Ferrari 330 P4 all notably differ in their general paces, then it'll warrant the creation of more classes. I, for one, cannot see the Ferrari 330 P4 (plus the Jaguar XJ13 and Ford Mark IV)
not being overpowered compared to the former two cars; at least two new classes seem likely.
EDIT: I don't know what the lap times these cars set at Le Mans, but I am able to see how many laps their most successful entrants completed in their respective iterations of the event, alongside their class:
1967
Ford Mark IV - P +5.0 - 388
Ferrari 330 P4 - P 5.0 - 384
1966
Jaguar XJ13 - P 5.0 (hypothetical) - N/A
1965
Shelby Daytona Coupe (as the AC Cobra Daytona Coupe) - GT 5.0 - 304
Alfa Romeo TZ2 - GT 1.6 - DNF
1962
Ferrari 250 GTO - GT 3.0 - 326
1954
Aston Martin DB3S - S 5.0 - DNF
Jaguar D-Type - S 5.0 - 301
Cunningham C4-R* - S 8.0 - 283
Maserati A6GCS* - S 2.0 - DNF
* Pebble Beach winner, has yet to be added to Gran Turismo.
Other notes:
-1954 was apparently the first year that the 24 Hours of Le Mans was televised. There was also only a single class among all entrants.
-For the classes, the number next to a class is the car's approximate displacement in liters. P stands for "prototype," while "GT" stands for "grand tourer," though I'm not sure what the "S" stands for in the 1954 iteration - perhaps "sport"?
-Although the Jaguar XJ13 never competed, we can deduce that its likely class would've been P 5.0, given that it was both a prototype and its engine displacement was 5.0L.
But back to my main point. Between all these Le Mans racers, there's a difference of over a hundred laps, specifically between the Cunningham C4-R, who has the lowest amount of laps among these cars (283) and the car with the most, the Ford Mark IV (388). If you think the Cunningham C4-R can compete with the Ford Mark IV - even after BoP - then no offense, but I think you're insane.
