youre not going to fit a 335 or a 345 if you plan on tucking the tire in the wheel well and doing any sort of spirited driving. im running a 315 on an 11" wheel with custom tubs and i took over a 1/2" out of the frame. i have 1/4" outside and 3/4" inside clearance. i am running a taller tire (315/35/20), but im also running a watts link which will keep the lateral migration of the axle to a minimum, especially when compared to the stock converging 4 link setup.
some may wonder why 3/4 inside clearance. the easy answer is that its what jon at driverz recommeded. the complicated answer (well not really) is that when the axle articulates it gets shorter. this is only complicated by the fact that the top of the tire moves in much more than the center of the axle. when i was measuring for tires i took this into account and was amazed at how much room was used up with only a little articulation.
also, (last part i promise) you lose a TON of real estate very quickly with the quarter panel shape of the 70-72's, so what you measure at the lip and what you measure 2" up from the lip will be vastly different. i know what your measurements show, but i think there is a little more to it.
i love your car and i love the mock up pics with the tire, i really just hope you can prove me wrong.
heres a pic of mine. i wish i could have gone closer to the quarter, but it really was impossible with how low it sits.
Tim
