John Deere AR engine parts

Good day,

Working on the engine from a '47 AR(S/N 267906).

The block & cylinder head are cracked due to water being left in the cooling system. Also, the babbit in the connecting rods has seen better days.

So, I'm going to be in the market for some replacement parts and was curious if there are P/N supercessions or other options that would be an alternative or perhaps an upgrade to the P/Ns I have that I should consider when searching for replacements?

My existing parts:

Block A2324R
Head A2325R
Con rod A2324R(original babbit) upgrade to AA5350R(insert style)?

TIA
 
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