Hey Dougie,
Nice find. What a beast! It's Hemi-Healy though. The latest issue of Wheelspinner, the newsletter of the Nasty Boys (and yes, contrary to popular belief some of us can both read and write) contains an interview with Bob Ida in which he explains the Healy spelling as follows:
"I had to pay for each letter. Saving one was cheaper. I lost the "E" and dropped a 1/10th in the quarter!"
Anyone interested in the full interview is welcome to PM their email and I'll shoot you a copy.