Start a new thread about an NV4500 swap, with a good title those that have done the swap will notice and chime in. Also search for past threads. Also look at “Advance adapters” they may have an adapter plate.
Several versions of the NV4500 exist, and they will adapt slightly differently.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-