I am by NO means an expert, but in 64, a year prior to the full-on altered wheelbase cars, there were 2% cars (if i remember right, Dick Landy was the first). They started fudging the fender well openings, and moved both the front and rear wheels forward as much as they thought they could get away with, keeping the stock wheelbase dimensions, because nhra would check. I think they altered the front control arms, and the location of the front leaf spring boxes. If i remember right, it was for super stock. Then they were caught, so they really moved the wheelbase for match racing, then nhra created A/FX for them. The rest is funnycar history.