Welcome to the forum, Frank!
* If you're not moving under power when you try to shift from 1st to 2nd, it won't. It's a "feature" (the easy neutral finder).
* You may find stock exhaust parts on the used market.
* You will almost certainly need to completely disassemble the carburetors and clean them, per this:
https://n4mwd.blogspot.com/2013/10/s...-passages.html
* I like RK chains for their blend of quality and reasonable price.