Its all in the heads. Id say 700-750 is easy to obtain. Get the heads to flow 425-450cfm and it will run like a raped ape.

[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]