I have a 500 Caddy that I had in mind to put into a 56 GMC. I bought the whole car just for the engine. It was a very low miler with lots of parking lot scrapes which made it worthless as a car. It would smoke the tires on the big old boat it was born in. The project is not on the top of my to do list, but the measurements I took when I pulled the motor out of the car, it wouldn't be too hard to fit. I had thought of having the crank drilled for a pilot bearing. If I ever make the swap, I will probably leave the TH400 on it and make it fit.