I'd use the water pump relocation plate over a short shaft pump. Currently have a short shaft pump on mine and won't do that again, no problems but not that great either..

No timing chain, just gears, if you're not tearing into the engine and don't suspect any problems with them I'd leave it alone.

May want to replace the front crank seal if it needs it or if you expect it may soon.

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-