Welcome aboard, where are you ?
I have 2 XL 350,s in stock frames, one is a 410.. An old buddy of mine built a Champion XL in the mid 70,s..still has it.
Another guy I hang out with bought a Champion 350 sideport this weekend but not sure when it arrives. He just finished building a Champion Suzuki 250.
We have a track 40 miles from here and race vintage flattrack. that is in Vernon BC .
Got any question about yours or what to run, which wheels are you running?