The MP 528 crate hemi was rated at 610hp, and that was with more cam and a single plane intake.
I don’t see why the hp/ci would be much different between the two........ so I’ll call it a little under 600hp.

That would assume the heads are unported.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads