Well it finally quit raining for long enough that it dried off under the van! Still tried to get me wet, but I managed, despite the parting shot of the 4th day of the storms:
I took several pictures, each one a bit further back towards the differential, trying to replicate the perspective in your picture. Please pardon the neighbors black walnut tree debris; the storm blew tons of it into my yard...
This picture had me clear back under the rear U-joint:
While it turns out that my 1981 B250 has a *very* different transmission mount bracket than yours, it does appear to me that we have the same transmission; the 727 is the one with the spindly tailshaft:
-And, it also appears that we have the same driveline angle! I'd never noticed it before.
Not sure that I would have tonight either, had I not been specifically looking for it; I was kept quite busy dodging spiders, earwigs, ants, daddy longlegs, and pillbugs while attempting to compose the pictures, LOL!
While I didn't measure it, my suspicion is that the engine is actually straight, (-or else the engine fan blades would get awfully close to the radiator on one side) while the driveshaft is running diagonally to meet the differential. They used that rear end on multiple vehicles, so it wasn't custom tailored for vans, and Dodge vans have the engine offset substantially towards the passenger side, hence the cramped floor space on the passenger side...
When our pictures use the line of the driveshaft as the central reference, it creates an optical illusion, which makes the engine appear angled.
I hope the pictures help improve your confidence in Annie!