That's impossible to answer without knowing what was done to it. What heads, compression ratio, cam, intake? A reasonable build, not using all truck 454 parts I would think in the 450-500 range. That's just a wild ass guess though, could be a lot less or a lot more. If it's a decent engine builder it really shouldn't be less than that, more likely more.
__________________
Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
|