Here is the link guys. Kev, it is really a 454.
I still think you would be better off buying a new zl1 block and new guts and then finding some of the vintage parts like the heads, intake, carb, distrib.. It would look very much like a vintage zl1 and run like stink. One of our board members has that exact setup. That is the route to go IMO.
http://www.paceparts.com/product.asp?3=56150