Taking 1974 360 block .60 over

Took it a part and it was already bored .30 over and .10/.10 on the crank really just trying to clean it up...my understanding is the 60 & 70 block had thicker cylinder walls...really concern heat issues, guess I should say for those reading it has j heads, and matching numbers hp exhaust manifolds and was looking to keep those rather the going with headers and stock radiator which has been flushed