Here is the pan sitting on the crossmember.
Front to back is my planned final location.
I plan on the pan sitting about 1" higher that where it sits. The bottom of the pan will be right at flush with the existing crossmember and the crankshaft centerline will be right at the same as the old engine.
In this location the heads will be about 1 1/2" forward of the most forward section of the firewall. Confortable amount of room from the engine accessories to the electric radiator fan.
The R&P will fit nicely under the pan with room for the remote oil filter line to exit.
It looks like, with the right header, there is enough room to get the exhaust out of the engine compartment.
Now for my bad news. I don't think the truck intake manifold is going to fit. My quick rough measurements show I need about 2 more inches. Swapping the intake involves changing the accessories and front drive. In a few more days I'll have some more concrete info.