Motor Options (Need Opinions)

[BHRS]

I drove a '70 1/2 Ton LWB 307/2bbl stock 4-speed for 100K+miles in high school, army, and college. The truck was 100% stock and had plenty of power and got 19+ mpg. The 307 is a good motor, but don't expect a lot of power like a 350 has. I'd install a Edelbrock Performer intake with the matching cam kit and a 500 cfm carb. The 600 will be too much for the motor. The 500 cfm carb will help with bottom end and mileage.

I agree with others on swapping out the 400 turbo with the 350 turbo, but if the truck is stock with the 400 turbo keep it. It is bullet proof and everything is setup for it mounting it.

Sometimes different is good.