Good morning. It very well may not need a complete rebuild. I just remember my dad talking about rebuilding it so Im pretty much just Fallowing his wishes. All I know is it needs all new gaskets and some carb work which is a good place to start.
I spoke to a few machine shops and got a few quotes and know it’s not going to be cheap. I just thought it would be a good idea to get it rebuilt so I know what exactly is done to it and while I was able to afford to.