Any solutions to a leaking 6 Cylinder ( 292 )?

[69_hafton]

Anyone have any tips or tricks for getting a 292 (or any 6 cylinder) to seal up good? I replaced the gaskets, then replaced some again with aviation sealant and the side covers still leak. I think the rear main is leaking too. I wouldn't think that I'd have this much problem with new gaskets, but am looking for someone that has has success in getting a good seal on these engines for more than a few months.

A separate but related question is would a fresh rebuild on the engine help keep things sealed up? I didn't do any machine work with the gasket replacements I did previously. I'd like to have a plan when I get into the flywheel replacement I'm looking at right now.