ChoppyChoppy
Tree Freak
I found a 1-bbl manual choke carb and retrofitted that on to my truck. 1 vacuum line to the distributor. Single wire HEI distributor with coil inside, I keep a spare behind the seat and can change it out in 10 minutes. Mechanical fuel pump out in the open on the block, not some POS pump inside the gas tank. That's on 292 six in a C10. It gets close to 20 mpg.
I'm happy with 8mpg in my C30. 350, 4 speed. About 7200lbs empty, 16,000lbs loaded.