Dang, that is going to be a beast!
If you are going that far, why are you even worried about trying to fit anything to the original bellhousing? With that engine you will need to brace the frame anyway. Just weld in a new cross member for whatever super duty bellhousing that works? Use a hydraulic clutch and your good to go. Maybe I am missing something?
Do you have the original NAPCO front axle? Send me a private message if you want to sell the locking hubs. Need 1/2 ton off a 58-59.
