I have 3.55 with a T5 and Edelbrock performer stuff. I think the acceleration is "more than adequate" (term used by Rolls Royce). I think you'll be very happy with the 3.55. To a large extent, your economy will be a function of your right foot, assuming the car is properly tuned.
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68 coupe, 302 w/ Edelbrock performance parts, T5, 3.55 rear, needs paint!
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