I would use another head if I was truly trying to get the Max Effort out of the combo. The CID intakes are the best cast 4BBL style intakes on the market. There's a decent chance you could mill down a 9.5 deck Hi Ram manifold to fit. For a inline head I would use a GV2 with softened chambers. The new 15* Brodix Head Hunters are nice with the right exhaust port on them. They flow over 400cfm but are about 50-60cfm shy of the GV2's. Otherwise I would look at the CID canted valve head, the Neal's or the Edelbrock SC1 heads.