Brushless is no problem for the XX, its no different to any other car - make sure the diff and slipper/hydradrive are set correctly and it'll be fine. The only thing to consider when running a vintage car with modern electronics is the weight distribution, remember these cars were designed around heavy 6 cell battery packs, if you put a modern lipo in it you'll find the front end very is very light, ballast and/or set-up changes will be required.
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