Love the look of your car. If it were mine, I would do what another poster said: leave the 2.69 rear gear and install a '79-'82 BW ST-10 transmission with the steep 3.42 first gear. It'll haul the freight off the line AND get killer gas mileage at high speeds. Following that, a TH400 or TH350 would work just fine. I installed a 2.56 gear in the back of my '67 GTO with a TH400, and although off the line suffered, it runs 2450 RPM at 80 mph and gets over 20 mpg doing so. 90 mph cruising is 3,000 rpm. Hard not to like on a car that's driven a lot on $4.00 per gallon gas.
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Jeff 
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