Jim: I have seen your song printed in a folk newsletter from 1964 with the "Hot Asphalt"/Kerrs tune. The tunes aren't so similar that I'd confuse them, and the newsletter version didn't have the parody chorus. It's extraordinary that anyone would want to replace "Ghost Riders" if that's what you had in mind from the start, but it happened. Unfortunately I don't have any more information easily accessible.

I've never heard anyone sing "Ghost Tigers". It's a terrific piece of satire and ought to be aired again before the old bugger pops his clogs.