Good luck.
Keep us posted on that 400 horse. That's almost a 1 1/2 hp/cube. Nascar engines make 2hp/cu.in so the engine shop has a lot of work cut out for them. It might be a push to be street able. Just say'in.
That's an apples to oranges comparison, the smaller displacement is gonna need a lot less of head flow to accomplish a certain hp per cid, a stock magnum head can do 400 hp. Nothing too exotic to handle and make 400 hp, the trickiest part is the 7000 ish rpms needed. Streetable would depend on ones definition it probably be better than most would think but probably just this side of the edge of a full race engine.
