Here's a forum discussion on the EMI-SUL engine as it was known, apparently only produced 1966-69; http://www.thehemi.com/forums/viewtopic.php?t=1520
There's a video of the engine being driven on a test stand in Portland Or. Looks like this was 2005, so you might be able to contact the guy through that posting.

I think I remember him posting on here for a short while now that I've looked at the video. I'll see if I can find the old post.