Hypothetical 318 Builds

So for 17 years, I ran a 318 6 pack in my 69 Fury ragtop.
Did a simple re-ring and bearings, had the original heads freshened up, double roller chain, HV oil pump, mopar performance repro 68 340 cam, mopar electronic ignition.
No idea what horse power or torque it made, but with a 2800 stall converter and 3.55 gears, that land yacht would pull 18-20 mpg if I kept my foot out of it and surprised a lot of 350 Chevys and 302/351 Fords.
I do know the front end would feel really light at 110mph. That thing had top end that never seemed to end.