I'm building a 78 4x4 with a 351m in it from the ground up, and I've gotten stumped with the vacuum layout. If any one could give me an idea where i can find a diagram for this old of truck I would really appreciate it.

 

Try your nearest public library. Mine is full of Auto manuals.

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2000 XLT Bright red, Flareside,extended cab,sport,5.4,bedrug,Extang tonneau.