Hey guys I just picked up a '65 Galaxie 500 with a 390 2v in it. The motor runs, but seems to have some vibration around the crank area at the front of the motor. I've already pretty much accepted that I will be rebuilding the motor, but I wanted to get some insight from you guys who probably have some more experience than I do. I don't care to make this motor a fire-breather by any means, but if there are some things I can do to help improve efficiency and maybe improve gas-mileage a little bit without spending a small fortune, I'd be interested to hear about it. In the little bit of reading I've done so far online, I've found kits to convert from 2-4valve heads, and also bigger carbs (4 barrel vs 2 barrel). The car will be a cruiser, not intended to run down the dragstrip. Also, the tranny seems to be leaking some, and when i put it into gear it seems to slip a bit before it really grabs and starts to accelerate. Is this something I could fix just by doing a rebuild, or will I likely need a new tranny? Last question- in my quest for better gas mileage, I thought maybe changing the gears in the rear dif might help some, is this a good idea or no?