Peter at Dragon Race Engineering in Broomfield is the best tuner in the area. They've got a Mustang Dyno and have done lots of 427s and S/C applications. They've also got a widebody C5 showcar they're building that's pretty cool.
I took a quick tour through Vette Connections last year on my way to see the Braves - Rockies series, which we watch every year, and did not like the looks of things. They might be great tuners, but they had too many cars crammed into a tight area. So, I thought there would be too much coincidence of damaging the car. Other than that, I do not know.
Peter at Dragon did some Trans work on my 383 car it was done ok but about 3 wks late. They had just move to a new shop and it was a mess. I would hope it is better kept now. Peter is a great guy to talk to and seems to have a lot of knowledge. Currently I am using a guy in Scottsbluff, NE he has a 427 car and seems to do good work they just worked on my 427 car and the motor is now @ MTI cracked sleeve. Very neat and clean shop. His # is 308-635-7404 ask for Mike Valentine.