I installed one in a 65 coronet.
not quite as small as an abody, but pretty tight as space goes.

my 318 came with a 727.
b&m makes a weighted flex plate that lets you run the neutral balanced torque converter, so I kept my 318 torque converter etc..

the 5.9 uses the 360 mounts like the la block and it has the truck mouting tabs.
I picked up a conversion set from schumakers(sp).

The pan is the standard 360 LA car pan. Got mine new from mopar. Several places still sell it with the pickup and dip stick.

I found the dip stick it came with did not work as well, so reused the magnum one.

I used the durango truck exhaust. Cleared pretty much everything. I did wrap it near the speedo cable and cable shifter.

Personally I would go electric fuel pump and keep the serpintine belt setup but that is just me. IF you do that, find a van for the power steering pump or it will wind up under the battery tray.