Could I get some ideas on what would work better for the money on a relatively mild 383 what would it take to make my tpi to work on a 383 injectors tuning computer and what not and the cost to gain of my tpi over like a holley 750 double pumper. Just some ideas looking at what direction I want to go obviously.

 

First a Holley 750 Double Pumper is not intended for mild anything.

Not sure what you are asking?

TPI = performance and high MPG (20 plus), takes time to tune.
Carb = Performance and low MPG (10-12) easy to tune.
The HDP will get even less MPG.

 

With my combo I am putting out 21mpgs

 

383 plus stock TPI intake equal tire-frying torque and no horsepower above 4000 rpms. You dont need a 383 with a TPI intake, as it already makes lots of torque, in my opinion. If you're going to build a 383, then you need a short-runner intake like a StealthRam, LT1 intake, or MiniRam.