A mech. pump is fine and with that build, you would be fine with a flow of around 110gph (thats usually good to about 500hp). There are tons of aftermarket pumps with this rating: Holley, Edelbrock....Just do a search through summit.

And +1 rethinking the carb cfm size. I think you'll be overcarbed with a 750....go for the 650 double pumper or anything below 700cfm.

 

What do ya'll think about a 650 speed demon w/ vacuum secondaries? Thanks for the advice guys

 

do i need a regulator for the mechanical?

 

Mechanicals don't need a regulator.

 

thanks man

 

The needle and float regulate how much fuel the engine needs.

 

so what do u think about the 650? right size for set up?

 

650 or 670 should flow about right, and ya you dont need a reg. for the mech. pumps

 

Yeah, for your setup, the 650 will be just about right. After you get her on the road and drive it for several hundred miles, you will be able tol tell if it is perfect or not. Good luck with it.