@ValerianMagnum , This is just how I would build a 5.2/318 for mileage and some power with the manual OD trans. (Generalization)
Top to bottom;
750 cfm
RPM AG or not
Ported iron or Edelbrock Magnum heads
Roller rockers - Final ratio TBD based on cam lift and available space in the piston.
Set slugs at zero deck
1-3/4 headers 2-1/2 X pipe exhaust to the bumper
A cam in the 218@050 area with as much lift as I could squeeze in.
4.30 gears on a 28 inch tire. (Max size) No less than a 4.10.
Im not sure of your gear ratio, so the one listed above is with use of the MP auto OD ratio of .69 to end up with about a 3.00 or so final gear ratio. A .71 OD ratio (MP OD ratio IIRC) is super close to that.
This should allow 20 mpg’s or more and make an easy 330+ hp. That should work really well with the 5 spd manual transmission.
(Edit, thanks @missing linc for the OD ratio listing. I didn’t know and winged it.)
