Here is what I got back from a knowledgeable used parts dealer.
Those 3700 pulleys are a crap design. Better off to switch to a 3400 pulley, and flywheel. I have new pulleys in stock, and used flywheels in stock. They are each $15.
xyz123,
I asked another guy about that and he was oncerned the timing might be different between the 3700 and the 3400.
Can your resource confirm this will work?
What I got back today for you.
Same ignition system on all 3400-3700-4000 series poulans.
I've done this swap a couple times. The flywheels are no harder to remove than any other flywheel.