Marty Schorr, author of "Tales of Motion Performance Muscle Car Builder" had some great things to say when he called in on Oct. 29th, 2009
Here's the interview with Marty Schorr - on October 29th, 2009
Backstory; Marty worked with Joel Rosen at Motion Performance in Baldwin, Long Island. This book is about Motion Performance and the way they built Hi-Performance cars in conjunction with the local Chevy dealership. 
A quick check of images associated with the shop tells the story nicely: https://www.google.com/search?q=motion+performance&safe=off&rlz=1C1CHBF_enUS744US744&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwi8hdjq7r7XAhUmiFQKHTv9CzAQsAQIYg&biw=1280&bih=590
This site lists the breakdown of costs for a Motion car build: http://www.nastyz28.com/motion/motion.html