360 heads on a 318 LA

Yes, the 360 heads have larger chambers, so add the cost of milling (decks and intake faces) and shorter pushrods to the swap. The 360 heads also have bigger ports which can be a mixed blessing. They will certainly flow more air and make more horsepower, but low RPM velocity so throttle response suffers. On a street engine, 302 casting heads with 1.88/1.60 valves and mild port work would make for a more flexible and responsive engine. If you were looking for a 350HP screamer, go with the big heads.