I put 15x10 rims on the back of my 69 camaro with 295/50r15 tires. The offset was 5 inches. I used corvette rally whells from wheel vintiques. That is the widest combo I have been able to fit. I was running 275/60R15's on 15x7 rally's with a 4 1/2 inche backsetting. I also am running a 454 and needed all the traction I could possibly get. The 275's just weren't cutting it. The rims and tires do not protrude past the fender. They are actually even with the edge of the fender. This combo will not work on a car that has been lowered. You may have to cut the lower shock mount approximately 1 inch up and redrill a mounting hole. My car was lowered two inches previously and I had to cut the shock mount in order for the 275's to fit so when I raised it back up the shock mount was already modified. With the 67 having higher arched wheelwells you should not have a problem with rubbing the outer edge. It is pretty tight on the inside edge but I only hear it scrub on off camber driveways.