Prior to that I had a Edelbrock that peaked at 14mpg or so.
I did not get that good mileage either until I messed around with the springs for metering rod pistons.
Meaning use soft springs,cut springs so the metering rod would not get pull out of the main jet so soon.
Small CI 6's ,create less vacuum when accerating as compared to V-8's.
Those Edelbrock kits are made for V-8's in mind not the smaller 6's.
Wonder if you messed w/the springs & what size Edelbrock carb did you use?
I could never get great mileage when using any 625 AFB or AVS.
But got really good w/a 400 CFM Carter 4 BBL.
Quadrajet ,when properly set-up can get really good mileage.
MBHD
