About the same as a car, new oil, new spark plugs, new water pump, new spark plug wires, some stabil in the gas to keep it from going bad, maybe a new prop if its bad, that's about it without rebuilding the engine if its not broke then don't fix it. I'd also get a shop manual it tells you everything you need to do.
The correct timing for a Mercruiser 3.0L 140 engine is 6 degrees BTDC. for a Mercruiser 120 the correct timing is 8 degree BTDC.
1-3-4-2
I am reconditioning an inboard engine SerA339144. dive me some info
I was quoted $120 without new spark plug wires.
tune it up
Mercruiser buys engines from many suppliers, including Chevrolet.
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You need to tell us what sort of tune up you are talking about ... HOME , CAR .... etc.
Timing for Mercruiser 470 is 8 BTDC at idle speed. Mercruiser Service Bulletin specifies 4 degrees BTDC, due to new gasoline formulation.