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Re: 2 speed rear diaphram needed
Well at least the vacuum advance will be easier to get..... Might look into an HEI too. Reliable and an easy mod. Only have to change one wire.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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