Butler was a name that came to mind, that is IF they would be willing to take on the project.
These guys have variety of engineered packages for Chevy, Ford and Mopar platforms.
http://www.nelsonracingengines.com/
http://www.youtube.com/watch?v=7u06OysOiZI
maybe just maybe they might consider doing a one off based on Pontiac block....but costs would be naturally higher than their normal stuff.