Best Gears for a 408 Stroker?

Hey. 66 Dart, 408, 680 holley, 3:23 gears, Gear vendor, in San diego Area. Had 3:55 gears. Was snappier. But not what I was looking for. With GV final gear is 2:91. It gets 22 MPG at freeway speeds. What I was looking for... And no slouch...
Full roller engine, Rhodes roller lifters, Magnum based. Really works well for a street engine/HP engine. Research them. Full lift at 3K .