Where to start - maintenance on a 340

RoRo7051 said

I guess I should have added that there is a bit of oil in the coolant and some oil leaking from one head.

My plan was to drain oil and coolant, pull the oil pan, flush the coolant. Then change all gaskets and filters to see if that fixes everything.

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I agree with some of the guys above. Establish a baseline, change all the fluids and filters. Replace easy stuff that typically leaks (valve cover gaskets and stuff like that), then run it and see what surprises you have. Hopefully nothing too serious and you can just enjoy it for a while.