Hello all. I have a 1980 F100 with the 300 that is in the process of upgrading the intake, adding a 4 barrel, and headers. The owner before me switched the 3 on the column to 4 on the floor. The rearend currently has 3.50 ratio and you can't even take off in 1st (way too granny) and by the time I hit 35 mph. I'm already in 4th so on the highway it just screams. All I'm looking for is a good running daily driver with a good mixture of fuel economy and cruising speed. What would be the best ratio for this situation? Thanks for letting me be a part of the forum and for any help that is given!