as stephen stated earlier, the original cars weren't designed for the sizes of wheels and Horse power people like today, and you can't argue with the laws of physics. I believe in safety first,,,I can attest to the fact that if you put a 300 HP 340 in an otherwise stock early A body and don't modify anything else, there will be consequences. To this day I never jack up my 65 Dart Hardtop with the doors open, that is why the company Improved and moved up to the 67 up style stronger body, chassis and suspension. a guy can weld a car up all he wants to make it stronger, but I am referring to stock original specifications, and to the guy here that likes an original car.
I love my 65, but it is flimsy in it"s construction, like it is still occupied by a 170 cubic inch 98 horse slant six.(1963)as compared to my 68 GTS.