I have a 66 Falcon Fordor and I really don't care to race it. It's my daily driver and I have driven it from Portland, OR south to LA and then over to Atlanta, GA. It cost a fortune in gas. I have since made trips to Florida and Louisiana several times.
I admit to being possibly the cheapest guy around, but if you could get me a head that would get me 40 mpg on the highway I would definitely buy it. Even if I had to add EFI and all the complications that entails. I would love to have a good running, fuel efficient engine in my car. Right now I think I get a little under 20 MPG with a 200, Ignitor 2, Autolite 1100, C4 and 2.83 rear gears. Unfortunately no overdrive on that C4.
I have no idea what kinda mileage this head you are designing might get, but if you have any ideas I would really like to hear em. But as my professor used to say, designing for max power is different than designing for max efficiency.
-Dan in Atlanta