I had a quick blast at Interlagos this morning and tried a few less fancied Gr.3 cars (brands I haven't raced before and are lower on the scale in numbers driven) -
GT Sport Statistics (r1s3.net)
Mazda Rx - Fast in a straight line but a bit oversteery at lower speeds - 157mph at line
Mazda Atenza - Slow but stable - 155mph at line
Peugeot RCZ - Nice feeling car, seems like a good choice - 156mph at line
Renault RS01 - Very quick through the corners, bit twitchy though, but a little slow in a straight line - 155mph at line
Alfa 4C - Solid MR car, little bit rear endy in the slow stuff but not bad - 156mph at line
Nissan GTR - Big, heavy, fast in a straight line, didn't like it much as felt I had to be so careful accelerating out of corners - 157mph at line
Porsche 911 - Solid car, no real strengths or weaknesses - 156mph at line
I just drove 3 laps on Mediums in time trial and tried to see what gave me the best result and tbh they were all within 0.3 of each other over the lap. Probably with more practice I might find one that is better than the rest, was time left on the track in all my laps, but it does show that gr.3 is pretty balanced (not sure about the Corvette tbh, looks a bit of a monster atm, not that I am racing much).
I'll probably end up in the VW