I think as Bill said that was the Margay kart, although at RIGP back in 2018 I think it had twin LO206s on it. Haven't seen anything of that for a while. Hamilton's twin flathead was faster and performed better in the vintage open class at RIGP this year. And no mufflers about made me deaf as I was chasing him so close in the heat race, LOL...And I thought dual West Bends were loud.That's very cool.
Somewhere i have pictures of a Kart with twin World Formula engines on it.
They both turn the same direction though.