A few things need some work here.
Numbers seem a bit out of place on all cars. The font is good, but the positioning doesn't seem right. The Discount Tire logos are stretched beyond belief and it just makes it look rushed. Roof # on the 82 should be black IMO. I agree with Vinny about the shade of red on the 80 and 88. I don't really like these cars for some reason, although the idea wasn't bad at all.