If you're gonna stick with that combo (cam, etc) Go with the merlin attitude (or equivilent) If you wish to keep the 781's, Drop the cam back, say no more than 515 lift on intake. Do the bowl work with corresponding valves like you mentioned. It doesn't require "huge" parts and peices to aquire what you want. Just good combinations. If your ambition to go "big" is where you want to go, Then by all means, go with the Merlins or equal product.