Ok I think that 750 is to big for near stock 440. I would try a 650 holley or the thermo quad. also something does not sound right. I had a 383 stock with Edelbrock performer cam, performer low rise intake and carb performer 600. pertronic ignition conversion worn out distributor in 69 charger with stock 727 trans and magnum manifolds with 906 heads and the car would smoke the tires no problem. the 440 should have more power than that! also it should pull to 5 grand if that is the cam you have. sounds like to me you have real weak valve springs if its not pulling to 5 grand. do you trust the engine builder? did you get what you paid for?
