It is pretty rare to lose both spark and fuel at the same time so rather than both let's see if either are deficient, we can chase the possible causes then.
No fuel in bowl
This is s fault in the fuel supply and delivery system external to the engine or possibly a stuck float valve. The recommended next test is to try running off an auxiliary tank.
Spark at the center coil wire but not at the plug
Possibilities are the rotor, distributor cap, plug wire or spark plug itself.
As long as you're there
It's easy to do a crude compression test by putting your thumb on a spark plug hole (plug removed of course) and cranking the engine. You should not be able to hold your thumb on the hole as the air pressure pushes against it.
All of the above three test good
My thoughts immediately go to timing.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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