I'm into building a 350 twin as well.
Purdy much franken bike, CB350 engine, with CL350 top end, and SL350 frame.
Rear wheel xl350, front wheel and forks are a toss up from SL350 forks with xl350 21", or CB500 forks with 19" wheel.
Got all the parts, waiting for a guy that has had the head for almost 3 years. Still working on new tubes and tires.
But will be on hold, going on vacation for a few months.