I have a stock 1976 L82 4 Speed (98,000 miles) and I have installed the following items. How much horsepower should this add to the stock factory HP.

Set of Hooker comp. long tube headers.
Duel exhaust with Flowmaster Super 44's.
Edelbrock aluminum performance series intake.
Holley 670 carb.
All items are brand new.
I also removed the factory air.

Thanks

 

Maybe 10 to 15, just a guess. I doubt the Holley gave you anything. You'd probably be better off getting a pre smog Quadrajet that has been tuned.

Did you remove the air conditioner or the AIR pump?