I have a 1937 Dodge pickup with a 1990 350 SBC and 350 Turbo. The engine had a Holley intake with an Edelbrock carb when I got it. The current setup runs great year round but only gets about 14mpg, would a GM TBI improve MPG? What if I used GM TBI and a 700r4 would that improve the MPG?

I was going to mount a 2008 GM engine and trans but the engine accessory setup would not fit under the hood and the cost of an aftermarket setup was too expensive.