Automobile(s): 1977 Coupe (blue), 1977 Coupe (yellow), 1977 Coupe (green)
Re: 425 engine swap
You should grab the complete drive train. 425, TH 400 transmission, and the rear axle. Buy the whole car. That way you can swap it all over and have any parts you need. Plus you may be able to sell off some of the other parts to recapture your expenses. The 425 will not bolt up to your existing transmission and will not work well with the existing rear axle under your car now.