Small block question

What should a decent built 318 built to a 390 stroker make for hp? I know there are a million variables but average. Performance heads and I believe a 750 or 850 Holly double pumper….. It will go on a dyno but not now. I bought it built so I’m curious, it revs fast and sounds awesome! Any thoughts would be appreciated, thanks

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With that manifold, I would be looking at a carb with annular boosters in the primaries. I hear the 950 works well. It is a hybrid carb and they put annular boosters in.