That should be fun.
Is that a combination brake/hydraulic clutch master on the firewall?
I'd expect this truck used bellhousing mounts instead of a transmission crossmember. I think if it were mine I'd buy a set of those generic engine and transmission mount crossmembers to mount the engine and transmission you are talking about.
Its probably got a multi-piece driveline. You'll probably need to have the front shaft modified for length and to take the yoke to fit your transmission.
I know they are ugly, but the hydroboost brake system works well, and since that truck weights an easy six or seven thousand empty, you sure don't want to mess with less than adequate brakes. Get another three or four thousand pounds on the back and it will be fun to stop...
