Does your trans have a dual bolt pattern? If not than you will have to get a different one. If you have to change transmissions the th350c (lockup) is a direct bolt in as is the 200/200c. The advantage of the 200 is it's 2.74 first gear. The 350 is 2.52 and the "c" means lockup converter for gas mileage. Can you find out exactly what the gear ratio is? We changed a friends Delta 88 (nice cars buy the way) from a 2.41 to a 3.08. What a difference! Maybe there is a car in the salvage yard that could donate a lot of parts. One car to look for would be a Chevy powered 77 Delta 88. It will have a Chevy trans (either a 350 or 200) that you need and a 2.56 axle ratio.(please verify axle ratio). As to the Duaejet, this is the carb that I am going to try first on my build. The calibration for the 301 should be close enough to start with for the 250. Why not try both carbs and see which one does the best? You could start out with the 1bbl on the stock intake and then install the 2bbl on another intake and see what happens to power, mileage ect. You could have an adapter made for the 1bbl intake but for the price of a custom made plate a little more will get you a intake. PM me if you decide to get rid of the carb,air cleaner ect from the 301 I might want to buy them. Jay 6155