Thanks for that link, Don. Very informative. I thought about Vortec heads but hated to hafta buy a new intake too.
76? I was thinkin more like the 64-72cc range. Any idea if thatd be close on a good pump-gas CR with that size chamber? I think the Darts are 64 and 72 (and 49) lol and the Worlds are 67, 72, or 76...something like that.