275/60-15 will fit with ease. As someone else mentioned, the 295/50-15's will also fit. Tire selection and tire performance in those sizes completely sucks though. After running 275/60-15's for a decade and a half, I presently have 275/40-18 on the back of my '70 GP. I now no longer have the staggered front and rear, because I run the similar diameter 245/45-18 and 275/40-18. My car drives and rides like a dream now.
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'70 GP Model J
467 Butler ported Edelbrock D-ports
Torker II intake with Holley Sniper 2
CompCams 236/242 hydraulic roller
Tribal Tubes tri-y headers full 3" stainless exhaust
TH400, 3.50 9" CurrieTrac, 245/35-20 Front, 275/35-20 Rear
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