Vintage Margay. What's a respectable asking price for this Kart?

It’s a Vintage Margay. The front right spindle is stamped with a number, but it pre-dates when Margay started keeping records. I’m guessing it’s a AmPac/Pro-X or Xpert. The engine is a 5HP Briggs but nothing on it is stock. Valves, cam, crank, rod and piston all have been upgraded. Tillotson HL314E carb & fuel pump, Airheart brakes, runs on Methanol. Kart is a beast and runs great. Looking for suggestions on price range so I can post it for sale. Thanks in advance!


I’ve seen a few nice vintage karts on Bring a trailer do well.