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Re: Transmission? Poor acceleration.
If it was truly built for short track racing, it was likely built for high RPM and a light vehicle. Trucks are just the opposite: a heavy box that needs torque at low RPM. But it sounds like you don't really know what's in the truck, so it's hard to say. Also, "lacking acceleration and power" is a relative term. These trucks weren't built with racing in mind, and the factory 350 (if that's what you have) might be enough to chirp the tires but that's about it. And after 45+ years it would be a tired motor anyway.
A good starting point would be to get casting numbers off the block and heads and post them on the forum. That way you'd at least have a ballpark idea of what your engine really is.
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