What's your take on this recent comment on same thread on another forum?
Easiest 'secret' to fuel mileage is long stroke. Make the fuel WORK!! Chevy 305 always did better than Ford 302. Why?? 3.48" stroke vs. 3" stroke. Less fuel (smaller chamber) did more work. Look at today's mileage champs - longer strokes, some engines are going back to undersquare (longer stroke than bore).
Next up is breathing. If you're gong to make the fuel work more, make it easier to get to work.
Odds and sods will take up most of the evening, but a good start is to look at what the OEMs are doing for better mileage. Whatever you can adapt, do so. Probably the cheapest for most hotrodders is to actually be HOT!! Run a 195º thermostat for better thermal efficiency. Thinner tires. Underchin spoiler to keep air from under the car.