You're right in wanting the slant head, though. I've seen the pics of motorized Stingrays. If you want to squeeze an HT in there with its spark plug intact, you'll need the slant head.
Or you could do what I saw in one post, and cut a hole in the frame.
(I'M KIDDING! FOR ALL THAT'S GOOD IN THE WORLD, DON"T DO THAT!)