Something different Building for MPG.

Engine and trans out of 318 out of a 86 cop car. (39K miles)
Used the 8 1/4 ear too. Relocated spring perches. 2.73 gears, as I recall.
(600 dollars for the Diplomat)
Got rid of the electronic Q jet and re-jeted a junk yard Q jet on the lean side.
Running cop rims (215/70R15)
Stock exhaust. (single)
23 mpg highway when I checked.
Can't bring myself to go to hedders.
No time and more trouble.