Funny you should ask, my Dad says the boat he had was a '67 or '68 Howard with a Pontiac. It was originally a 389 and we put a 455 in it for it's last trip out. Unfortunately it went away 20 odd years ago, I always wonder what happened to it.
We only have a few pictures of it, maybe someone can confirm it is in fact a Howard. His was a v-drive, don't know about the availability of jet powered Howards, but being the late '60's I'd say not very many, if any.
Here it is at Perris in the early '70's
http://i6.photobucket.com/albums/y20...f/Dadsboat.jpg
Here it is just before my Dad sold it.
http://i6.photobucket.com/albums/y20.../Dadsboat2.jpg
Here's the Pontiac set-up he had.
http://i6.photobucket.com/albums/y20.../Dadsboat3.jpg