Attach standard timing light to #1 cylinder (Highest driver side cylinder) . Have some one else run the boat at full throttle in the water and verify timing advance setting using the marks indicated on the flywheel at the pointer located in the right front of the flywheel. Better done in the evening for better visibility. Believe your motors calls for 26 degrees advance but I run it a 24 to save the old girl. 1984 235 needs to run 89 octane at a minimum and like high test all the more unless you have the low compress head gaskets which is unlikely as they are getting harder to find anymore.
P.S. You can also try just pulling the thermostats out and running it that way to see if they were the problem is as well.
Kamikaze
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74 V20 CC with a 150 Johnson (Gone but not forgotten)
89 V20 Cutty with a Tower (Build in process)
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