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I would take a guess that it is a 1986 model.----Why did you pick the rebuilding of carburetors as step #1 in this fixing process ?----And I would replace the water pump impeller before launching the boat !

Does spark jump a gap of at least a 1/4" ( 6 mm ) or more on a test device ?-----Spark plugs are not a good way to test for good / strong spark

Check gear oil first.

A 20 HP or a 300 HP motor ??

Post picture of the cowling !

You need 4 new pistons and rings to do a proper lasting job.

The main water intake is behind the propeller.------So put the boat in the water for testing.----Or in a deep bucket with water 6" above the water pump !----And check the thermostat as they are often stuck open.------Simple as that.

Debris / junk in the shift piston bore would jam the piston.----The spring is only so strong to move the piston to get forward gear !

The water intake is behind the prop on this motor.----If you used muffs what style did you use ?

Cylinder head will be warped.----Must be trued up before new gasket is installed.

Was the water tube installed in the exhaust first ?-----Before to installed the lower unit ?

Check the gear oil.-----Then take lower unit apart.----Gears are stripped is my guess.

Johnson / Evinrude parts fit.

Details first.-----Model # ?----Are you sure it is a 35 amp stator on a 1982 model?

Start with a compression test.-----Post your numbers.----Then see if each lead has spark that will jump a gap of 3/8" ( 1 cm ) on all leads.

Repair manual for a 25 or 30 HP would be ideal for that engine.

The 6 volt system was last used in 1956 I think.

Motor needs to come apart for proper repairs.

These repairs are easy.

Too far away for shipping of parts !!