Ever since I got my '66 289 on the road, it has had horrible gas milege. It was originally a 2v I put on a edelbrock 4v carb/intake. Still as bad as ever. I know the 4v doesn't help but it should be better then it is. My friends 350 Nova gets better milege then me. Any suggestions how to correct this? Also my fuel gauge doesn't work correctly. I can fill up the tank but the needle only goes to just below 3/4 of a tank. Do I need a new sending unit? Thanks for the help.