[cableguy0]

I build hot rods for a living. We dyno every engine. Prior to now I ran a speed shop and we had a full service machine shop. We built engines everything from bone stock to 900hp naturally aspirated small blocks. I would bet money that on a legit dyno your engine is making no more than 375hp. Vortecs just dont flow on the top end and your cam is too big for vortecs in the first place. Most people who try to port vortec heads do more harm than good. Dont take me wrong Im not jumping on you on dogging your engine etc. Im just throwing out some real world experience and legit advice. A 350hp small block runs like a scalded dog. Just dont expect vortec heads to pull like a freight train past 5500rpm. They run out of flow capabilities. Yes I will say on paper that a 750 is too big but in the real world its likely the best choice. I however wouldnt have paid the extra dough for a demon. All you gotta do is go to the local drag strip. You wont find many edelbrocks or demons on serious cars. IM not saying holleys are perfect. Nothing is perfect. Any carb will require some tweaking. Most of the time the problem lies with the guy trying to do the tweaking regardless of the brand of the carb. I know some pretty serious engine builders that refuse to even touch a demon. Im talking guys that participate in the engine builders challenges etc etc.