He can put the 67 273 heads on the newer 318 to increase the compression... The 67 273 heads are closed chamber and also have the standard intake bolt pattern...
Put the 67 273 heads on it with the fel pro .040" head gaskets and the compression will be better than the stock 318...
I put a set of 920 heads on a 72 318 and had them ported, 1.88" intakes, 1.60" exhaust valves and hardened seats...
