Hmm... I'm 265 lbs and you'd think I'm 50% body fat, but when I was in the pool this past week, I found I still don't float, I must be full of sh....., wait, sometimes that floats, I don't know what it is, it's not that I'm 7'2 in which case 265 might not fit that bad, but at 5'11", I look like a fire plug.
Anyway, STOP DRIVING MODERN CARS!!!!
There, does that fix the problem? It's a heck of a lot cheaper anyways.
I think the stock wheel is 16" in diameter, measure the wheel you have in there now. Grant makes 3 different sized classic wheels, a 13.5", a 14" and a 15". If you have a 13.5", the extra inches make a bunch of difference even though you'd think not. I'm also wondering if there is a difference in steering ratio between a I-6 equipped car and a V8 equipped one. The Steering Store website shows a 16:1 manual box (3.75 turns lock to lock), a 19.9:1 box (4.625 turns L to L) for '65-'66 Mustangs and a 22:1 (6 turns L to L) for the Comet, Fairlane, and Falcon of the same years. Check how many turns you have. Won't make that much difference in effort, but it'll turn more with the faster ratio and that might make a difference.