J&J has some huge top end cams, he has some for sale in the want ad section. But, the more top end biased cam the less rideable your machine will be. The big big cams are pretty much for drag racing only, as a high hp motor would be a real handful with a big top end hit that these cams produce. I had a Web 208 for awhile in my 544 and it was great for drag racing and hill shooting, but was no fun to ride anywhere else. And this is a mild top end cam compared to J&J's monster cams. In addition to rideability, you have to do valve train mods, like cam tower clearance, valve guides, etc.