The 4BT swaps site will be a tremendous help for your 6BT.
Most everything they talk about with the 4 also applies to the 6.
They even have a section for 6BT swaps.

And also a section for "other engine swaps"
There are three current threads about 4-53's, one going in an AD 1 ton.

Grigg

•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-