They can be run in SS just as you see in that pic. In fact it was originally done at RWR before Rick closed as were all the Aussie Pro Stock stuff. Used to be tons of that stuff lying around there. Ryan worked on the stuff while at RWR always has said if we ever abandon the little chief this would be the replacement. The biggest issue with them is finding a block that holds water for classes like SS and Comp. You will hopefully see the B/A record broken again this year by Brandon Hutala with probably the best P5 engine out there. I believe he set it at 6.86 two years ago with that same engine. If you ran a class where a stock block is not a requirement them a billet is out there for them. But its a cube limited deal and if you wanna do that a 99/06 is easier to find parts for most definitely unless you just gotta run a SB