Assuming your cam and lifters have gone bad -

Maybe if your top ends have all been good including oil consumption,
you could go the barnyard repair approach & split the case, replace the
main & rod bearings (they are almost certainly going to be
contaminated), the cam and followers, and thoroughly flush the oil
galleries and crankshaft oil ports before reassembling.

Might it even be practical to leave the pistons in the jugs so that you
wouldn't have to deglaze and re-ring it? If the engine is equipped
with a full flow filter it is possible that even bearing replacement
might not be necessary, but if the parts are not that expensve I can't
imagine that to be practical.

There might be a requirement for $ rod $ bolt $ replacement on any
Lycoming di$a$$embly. If it isn't mandatory though it I wouldn't
replace them.

This assumes the debris hasn't chewed up your oil pump or caused any
pistons to score in the bores. No matter what you do, cleaning up the
debris is a very important part of whatever you end up doing.

This is not an A&P thoughts though.....