Hey Tom, I'm having a C5R 427 motor built and installed by Automotive Performance Engineering (APE) in Macomb Township- M59 and Groesbeck.
The owner previously worked for Roush Racing building engines and then with Katech building the C5R engines (Katech supplied the engines for Pratt and Miller.... who builds the vettes for the Corvette Racing Team)
They are a bunch of gearheads that also build and race there own drag cars. Although they are a small shop, they seem to know there stuff. My car should be finished early next week, so I'll be able to give you first hand experience on my dealings with them at that time.
Brett