Biggest tire under a stock suspension dart????

Ive got 235/60/14's (BFG Radial T/A's) under my 70 with stock suspension(8 3/4). They are stock /6 leafs with the leafs strapped in the front. The stock snubber has 3/4 inch clearance, which I understand is the starting point for snubber clearance adjustment. I could have put 255's under there but it would be a tight fit at the leaf spring, right now I have about 3/4 inch clearance there. I have seen 2.55's with 5.5 ralleys set up on the same year car and the 255's rubbed a little in a hard turn. This was probably because of the sidewalll flex because of such a small rim on a bigger tire, almost a 10 inch width tire versus 5.5 inches on the rim.