Can't really trust the compression as the rings haven't gotten hot for years, but is is a good idea to check
You can check the cylinder visually by unbolting the cylinder head and looking into the bore. If the sides are smooth and without scoring or smearing your probably fine. But with a bike that old, you may be looking at a tear down to replace the bottom end seals
It's important that you say what carb you installed and what jet is in it....that way we can tell you what jet to run, you want to handle that first so you don't seize it when it does run.
The best option would be to clean the original carb and reinstall it. Or if you did buy a factory replacement style gurtner, put in the jet from the original carb.
These are single jet carbs. (edited)