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There is an adjustment for the shift function under the hood.----Fairly easy to see how that is done.

Could be an issue with the prop itself.----Is it a jerking feeling as if you hit a log?----I would take lower unit apart to inspect clutch dog.

Is there a round " welch " plug on the power head with model #

Any pictures?----Find / remove the high speed jet.-----What # is on it.

The roller bearing on a 1959 DOES NOT press onto the crankshaft.

What does the spline on the end of the driveshaft look like ?----Full of rust?----If so the spline in the crank may be damaged / weak.---A potential failure point.

West Marine will likely have something on the shelf.----Find a marine accessories catalogue or give them a call.

You need to have that thermostat assembly in there.----Your location ?

In my opinion when you acquire a 50 year old motor you need to do a complete evaluation before spending any beer tokens.---Post actual compression values here.----If around 140 PSI ,look for and find a used lower unit.

New rings on old pistons may be a mistake.

EV fires are scary enuff.-----No way would I want current Lithium battery in a boat.----No place to go when an event happens.

Make sure it is not water logged.----Saw a Whaler go for scrap because of that issue.

Up and down play is normal on the driveshaft.----Factory stainless keys for impeller were never an issue.----Using --TYPE-C ---gear oil ( premium blend ) in the electric shift unit ?

Agreed.----That 31.8 Cubic inch block was even used for the zephyr sail drive rated at 15 HP.---The earlier models were 35 HP and later the same unit was 30 HP at the propshaft.----So all these ( 20 / 25 / 30 / 35 HP ) models use the same block.----The 15 HP block ( have a new one ) has tiny...

Canadian 20 HP model ??----Without a model # you can not expect a proper / correct answer

Maybe the driveshaft is jammed into the crankshaft with rust.----Shift rod is disconnected ?

Remove water jacket cover.----Replace the gasket.

You removed trim tab ?--Hidden bolt there perhaps.

???---Buy a bolt and make the stud.

The roller bearing fits / locates on a dowel in the block.----Sounds like you have to take it apart again.