Re: 1966 GMC 1/2 6.2 diesel swap
GM 6.2/6.5 diesels have the common Chevrolet bell housing bolt pattern, and generally use 454 motor mounts. Chances are pretty good if your truck is set up for a 454, a 6.2 swap will not be too much trouble. They weigh about the same as a Chevy big block too.
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