318 magnum heads

is it worth the effort and money to use them. somebody put 69 J heads on the 76 360. just going from open to close chamber. I am a J and X head fan. my 67,69 barracuda's run them and I know what they will do. I was wondering if the swap would be better. 318 has somewhere around 1.92/162 valves is it true that the r/t magnum heads came with 2.02 intake valve.