Located an NV3500 2wd transmission and plan to purchase/pick up 1/23/2022.
The engine machine shop has confirmed that my 350 block is okay, next step is to determine what block machining is required.
After decisions are made about the bore size need to work on ordering engine parts (including decision regarding 350 or 383 displacement). First blush is to go with the 383 but depending on heads and cam the increased compression ratio could be a concern (would like to retain regular gas).
Appears my driveline direction is taking shape with the 350/383 SBC engine, NV3500 manual transmission, etc. The existing (original) rear axle ratio will result in higher engine rpm at 60 mph cruise than optimum but with taller tires should be acceptable.