I also have 3.55's with a C-4 in my 67. I switched from 2.79 to 3.55 when I had a 289 in my car and it improved my 1/8th mile et by half a second. They are great for driving on regular streets, but it revs a little high on the freeway (not too bad unless I am driving far) I would not go farther than 3.55 without an overdrive though.
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67 Fastback - Arctic White Pearl paint
351W 415 hp, Trick Flow Alum. Heads, C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars.
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