Can a n/a small block make 900 hp? My guess is a R5/p7 may be the cheapest, if it would do it. If it could be done with a R3/W8 I'm going to say over 40 grand. My R1 Indy head will hopefully make 650-675 on pump gas. Knowing what this build has cost I would've taken a different route, or maybe said screw it and sold out.