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TBI is great for mpg. My 91 would be better if I had thought about it before I built it. Make sure you get all the wiring.
The 12FF in rear is going to be harder to find tall gears for. Axle codes are on the inside of the glove box.
A 6.2 would get much better mpg, but its a dog.
A 700r4 is decent, basically an overdrive th350. I've got a 4l80 (only year the OBS got them), and its taken a beating.
I'd think about tucking in the headache bar to cab width and radiusing the underbed toolbox edges also.
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Shooting for 600 miles of range at 65-70 mph out of a vx.
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