best compression ratio street build?

My 318/904/3.21 drivetrain was from a '79 car. The tires were 225/70/14's. The car had a good bottom end. Though the combo lack a decent ratio, it wasn't a bad performer for what it was. Stock heads and comp ratio for '79 and all.

Keep the cam small. Mine was 218 @ .050 for the intake. (228 @ 050 exhaust) Do not exceed this IMO for best mileage possible. Following DGC's build with a cam like mine or a size smaller would be best with 3.23's. and still have the car move well and get good mileage.