you're be on the right track. see what you really have with a gauge then trace it from there. from the sound of it there is probably some seriouse sludge built up in that thing. if that's the case, pull the motor, build it back to specs, learn a few things along the way, and have a good running motor. sixes are fun to build.
"The Marines I have seen around the world have the cleanest bodies, the filthiest minds, the highest morale, and the lowest morals of any group of animals I have ever seen. Thank God for the United States Marine Corps!"
Elanor Roosevelt
1966 c-10 stepside
1966 c-10 fleetside
1964 c-10 fleetside
1964 c-10 short bed
1964 c-30 flat bed
1964 c-60 dump truck
1968 Impala
1969 Nova
1971 Nova
1975 LUV
1976 C-30
1977 K-20
1966 SS El Camino
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