I've got a LPW ported 718cc, Boyesen Rad Valves, dual 38's, ADA head with 35cc domes, dual cooling, B-pipe with Limited chamber, Jet Maniac waterbox, MSD enhancer and the 9/15 is perfect. I have a 10/16 on my Blaster with a 718 and it does have a little more top end, but the 9/15 is perfect for...