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Swappping to a M22 rockcrusher or M20 are as easy as dropping a M-21 in the car, so yes those are doable. As far as the differences between Turbo 350s and turbo 400s, there are basically two things that most people look at. The first is loss of power through the drivetrain. With a Turbo 400 you can expect about a 50 hp loss going from flywheel horsepower to rearwheel horsepower. In turbo 350s the loss is monr along the lines of 30 horsepower, so you actual save 20 RWHP by using a turbo 350 over a turbo 400 (around 20, not exact). But the downside to that is durability. You can make a turbo 400 practically bulletproof and hard enough to take all the horsepower you can make. With a turbo 350 there are DEFINITELY limits as to how far you can push one. I personally would rip that powerglide out of there as soon as you can in favor of a turbo 350 (especially if you plan to keep the inline 6), or convert to the manual if you have extra money to use. With that extra gears over a powerglide you'll notice a good jump in gas mileage and improvement off the line if built right.
Rob
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