you're going to have to tear the engine down before you can know.
sometimes a rod will punch a hole in the side of the block, break the cam / cam valley, etc. if any major structural damage like this has occurred the cast iron block *cannot* be ( or, it can be, but it's very expensive and highly specialized, ie - the entire block has to be raised to +500 degrees while worked and brought down to room temp over a period of ~two days after repair ) repaired due to welding heat changing the composition and tempering of the cast iron.
given the lack of resale value in Buicks and Buick small block cars in general, a 455 swap would probably be the preferred option in that case.
IF damage is limited to the rod/piston in question then a full rebuild should be possible without getting too silly on expense.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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