It would help cooling.
It raises the compression, and gives you more power for sure. My bike was piped, jetted, air filter, reeds, blah blah, after I threw the head and domes, and advanced the timing it definately had more power through out the entire RPM range, instead of just when it hit pipe, and at top end.
Domes depend on your elevation.
It's well worth the investment. Definately make your bike more solid.