I started messing with the jetting yesterday after getting a set of 50 range jets from Treatland. It was happiest with the 58 in there, but didn't want to idle. That said, it was brapping noticeably better with that size. Spark plugs still looks like it's running lean though, and it idles better with half choke.
From what I read, these clone SHAs actually come with a main jet around #68. Gonna fiddle with the 58 jet and see if there was something else up with it. But it seems like it wants something bigger. Gonna order a set of 60s from Treatland and try those out. Weird that it seems to want a jet that big for a stock motor, but I guess it wants what it wants?
Thanks for the help y'all, I'll post results.