275/60-15 fits with ease and that is a 28" tall tire. A 295/50-15 ran close for me but okay. I have seen a '70 GTO with 305's, but do not know if a GP can get there.
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'70 GP Model J
462 Butler ported 87cc Edelbrock D-ports
RPM intake with Holley Sniper 2
CompCams 236/242 hydraulic roller
Tribal Tubes tri-y headers
TH400 13" Continental "Jim Hand Special"
3.50 9" CurrieTrac, 245/45-18 Front, 275/40-18 Rear
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