Danny,
I deceided to keep you company! I would guess that the responses are few becuse there are a few factors to consider, Easy answer is yes. however not all 265.50.15's are the same size, stuffed wheels look awsome stopped but not always good for daily driving. If the springs/bushings are weak/sagging there will be lots of side shift causing rubbing to the inside of the fender wells. a full tank or passangers will lower your car a couple of inches. I have 295 50 15's euro T/A's tucked in my 68 with un-cut wheel mouldings (Multi-leaf springs with Anson ground grabbers,- bolt is in) The rims are 15 x 8 with a 4.5" back space. The only rub I have had was a bad dip on the 405 freeway at high speed. They must have rubbed the tops of the fender wells as there was no markings on the tires. Hope this helps.
Victor