Duster, what max RPM do you plan to run it? & what is the duration @ .050?
I dont think putting 318 heads on a 360 would be a good idea , unless there the mid 80s #302 casting off a taxi or cop car 318, or maybe the magnum heads( of course that requires a few mods).
If these are the regular old 318 heads of the 70s & early 80s, your really gonna hurt the flow with those heads, More compression ? yes... but much less flow. John