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I don’t have any experience with 72-later 340s but conventional wisdom for 70-71 340s is they were installed prior to paint (should be painted engine color).
I used this gasket kit:
https://www.ebay.com/itm/Mopar-Chry-340-P5249320-upgrade-small-block-90-degree-oil-filter-adapter-gaskets/274465065689?
It calls for 40lbs.
Depends largely on the condition of originals, but I personally favor unrestored stuff. You can see exactly what you’re getting and can decide for yourself if it’s necessary to restore and how best to restore it. It’s only original once.
A well known guy on Moparts and e-bodies.org (mccannix) had a pretty good stash of original/US produced NOS Chrysler fuel pump rods at a reasonable price. Check with him.
https://board.moparts.org/ubbthreads/ubbthreads.php/users/221/mccannix.html