Make sure you have lots of lubricant on the pistons and bores and just turn the engine by hand, a lot. At first, wipe off the cyliner bores at the bottom of the downstroke and re-lube before each piston starts back up.

When the rag comes out with no more orangish-red rust color on it, after wiping down the cylinder wall, you should be ready for start up. (change the oil first!)

When I fished commercially in Alaska, every year there were boats that had stuck cylinders from sitting all winter. Those that pulled the head to free things up used this process.

Those that didn't pull the head just worked the crank back and forth until everything was broken loose and then hit the starter.

Try to feel for any rings dragging as you're rotating the engine; it should be a smooth and consistent turn.

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1981 300TD "The Green Lantern"
1980 300TD
1983 300D Euro "China Cat"