If you are trying to get good gas mileage and great acceleration there is no such thing, unless u have a fuelie with a 5 speed. When u have a 60s car like that unless its your daily driver mileage shouldnt be a huge concern, get the 4.11s and get a big smile on your face, just dont go on the highway, it will rev too high. You'll be happy with the gearset, I just helped my brother put in 4.11s and a 5 speed in is 67 mustang, and it pulls like crazy, but the difference is hes got fuel injection on his 289, so he actually gets decent gas mileage
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