Ah yes the wheelies, in 60s cars, with jacked up power and half the parts removed for weight reduction, on tyres never designed for them.
People seem to be ignoring that the cars in question - let's use the Ferrari as our example - were already built on the bleeding edge of technology to win in the top racing categories of their time.
perhaps the problem is that people see the need to put more power, less weight, and science fiction tyres on a car that already exists at the extremes of engineering. It's not as simple as putting slicker tyres on to gain grip all around - especially if the whole driveline was designed for a much lower level of grip.
i heard Bill Goldberg on a Hoonigan video the other day exclaiming he has a Cobra that pulls wheelies at 90mph in 4th gear. Seems those complaining that the physics are "totally broken" might not understand the characteristics of these older cars built for speed with older methods. No downforce or aero to speak of; just the best power to weight ratio you can manage in the best handling chassis you can build.
if you ask me, in any decent sim, messing with the balance of such a car should absolutely be a recipe for wheelies and other disasters.