Do not upgrade the gun!
A 20g. with 32" barrels is a rare enough find and in a magnum too! That is a rare and valuable gun. Worth much more, proportionately speaking, than an upgrade would be after the upgrade work is done to it.
To what extent to restore it all depends on the condition. You should post some pics so we can see.
If the replacement buttstock is obviously not original in either form or quality, that should be replaced to be correct.
A replacement buttstock could be finish matched to the forend and the patina of the rest of the gun so that it does not stick out like a sore thumb on the gun. Since sometimes one nice new part of a gun can lead to feeling the need to do more work on other parts.
The extent of original finish on your metal will be your determining factor on how far you want to go with any restoration work.
I am sure that gun has seen many duck blinds over the years.
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B. Dudley
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