remove the plug from cyl #1 (or any cyl), put your thumb over the hole, turn
over the engine until you feel compression coming up, then some more, then use
a small screwdriver stuck down the hole and turn the engine over very slowly
until the piston has stopped moving up.

Take cap off distributor, noting which plug wire the rotor is pointing at,
insert distributor in hole and tighten hold bolt enough to kept the distributor
from slopping around. The spark wire the rotor is pointing is the wire you run
to cyl #1. then run the rest of the plug wires to the prop plugs in the proper
order.

You engine will start (assuming all else is okay), and then time the engine.
Then go boating and enjoy.