How much horsepower for 318?

I am curious as to how much horses my rebuilt 318 should make.

It's the original 1974 318 in my Duster. Here is what has been done:
-Bored .30 0ver
-New pistons
-Original heads have been ported for a little more flow
-340 valve springs
-340 spec cam
-double roller timing chain
-windage tray
-New pushrods
-ECU orange box
-570cfm Holley 4-barrel street avenger
-Performer intake manifold
-318 manifolds and duel exhausts
-New accel plug wires
-And just the fact that just about everything else is new. Power steering pump, distributor, water pump, etc. People have been telling me that I should be making around 300hp. In a 3,300lb car, I would think it would run into the 14's with no problem. The only negative is for now the 8 1/4, 2:76 gears will ramain in place. I know I need to get something better. Like 3:23's. But that will be next year. From what I was told the compression should be at least 9.0. So I think 300hp isn't out of the question. What does everyone think? Thanks