Don, yes I have accumulated lots of Champion jaildoor chassis over the years. When the slot car world converted to anglewinders, the inlines were almost worthless.
The jaildoor Champion chassis work well with modern black foam road race tires. Drag race tires are way too soft.
The Champion front wheels look great, but they are on the large diameter side. I like running the chassis with a vintage set of set screw wheels trued on the Hudy tire machine. The end results are front tires a hair undersized, and less pressure with the front wheels on the track surface. Guides are firmly planted in the track with guide spacers if needed. Soft Cox braid or equivalent is a must. Cox quick change guides work great. Also, weight added to the drop arms helps with faster cars. Well, that is the Champion jaildoor world according to me. Thanks for your interest, Don.
Rodney