I would like to know if anyone can tell me how much horsepower I can expect it to haveafter it is built up?

I own a 1996 GMC Sonoma pickup with a 4.3 L. V6 X engine. I am having it rebuilt, boring the cyl. .30 over and .12 to .15 shaved off the heads with Pacesetter Shorty Headers. It also has a throttle body spacer and cold air induction system. after the engine is rebuilt I will use a Hypertech Computer Programmer to change the computer settings to maximize the engine output. Any info will be helpful. Thank You.