[blykins]

There are cheaper ways of getting there than the kit you listed.

I'd use a Scat rotating assembly with a cast 4.500" stroke crankshaft, forged I-beam rods, and a good set of forged pistons. There's really no reason to stop at a particular stroke when the larger crankshafts cost the same. A 4.500" stroke gives you around 557 cubes depending on the bore. I can do a complete rotating assembly, with a Scat crank, Scat rods, Probe pistons, rings, and bearings for around $1300.

The Edelbrock Performer RPM heads work well for a street build. Even with a 2.09" intake valve, we've got them to flow almost 350cfm. They would be a cheaper alternative to some of the high dollar heads.

Match it up with a good hydraulic roller camshaft, ditch the Torker intake in favor of a Victor 460 and you'll have your 650hp.