Little Red Express
OK, gotta put a picture of my '78 D300 1-ton dually in here. It's an Adventurer Special Edition with a factory-original low-compression 440 and a Dana 70 4.11 rear end.
"the carb had other issues that we could never work out."
Was it a ThermoQuad?? If so, it sounds like the O-rings on the metering tubes were worn out. Bought new O-rings at the hardware store and solved the problem.