I have one in a 74 highboy. Don't like having to use/buy high octane gas. Even with the high grade gas it still falls way short of what I expected before putting it in the truck. I think the book specs lthe hp at 365. They also have the highly sought after "DOVE-C" heads. Which is part of the problem which requires high grade gas, high compression (I think 10:1 or 10.5:1). High compression is cool if your a drag racer, but if you want to run 87 octane gas in your wood hauler, it sucks!