I have a 350 ci sb engine that I'd like to get an estimate on hp. Here is as much as i know about the engine.

350 bored .30 over
Holley 650 double pumper
Edelbrock Victor jr. Intake
Isky hydraulic cam .292 duration and .525 lift
Stock cylinder heads with 1.94/1.50 valves.
Only thing done to the heads is a 3 angle valve job.

300 to 350 is a guess. Some killer heads would really help that cam and intake. If you weigh your car at a truck stop then run it several times at the strip you can get your HP via formula.