My 1984 C20 crew cab had the factory 454 Th400 3.73 rear end. The Q-jet was rated at 800 CFM for that application. I got a consistent 10 MPG no matter what. I would put a good Q-Jet together, get rid of the headers and tune it as close as you can to stock.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| 
