power plus gas milage

If it will be a while until you are ready to turbo one, the 2 BBl along with a heavy milling of the head made a huge difference for me years ago. I believe I had .100" milled off the head, I did a back cut on the valves with a file in a drill press, (stay away from the actual sealing portion), and do a little bowl porting, run a little bigger single exhaust. I saw a dramatic increase in low end power, with a good bump in mileage as a bonus.