Just drop a B230E in it, it's a bigger engine from the same range so won't be a problem with Historic status and you won't have to worry about the infamous B200 piston slap on #4 cylinder.
As for adding some Carlube ATF-U or NAPA MVA, usually a good idea but without knowing the exact nature of the problem with those two low pots, it may or may not do any good.
About 10% of normal oil volume works best.
Whenever i do an oil/filter change, the first 0.5L of fresh is one or t'other of those ATFs, both are synthetic and mineral doesn't work as well. It stays in until the next oil/filter change. People who haven't tried these things shouldn't knock but they obviously have nothing better to do all day.
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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