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T90 rebuild. There is a large spacer between the bearing retainer and the throw out bearing carrier.
Have not seen this before. Could not find this spacer in diagrams. Seems it would change the clutch fork leverage.
Is this correct for a 1952 M38? Or a motorpool addition? Thoughts?

No, it does not. Too me it looks like the front crankshaft spacer. Either way it shouldn't be behind the throw-out bearing.