Welcome to the site, Paul! I noticed you are from KC...a fellow "SHOW-ME" stater!
You might want to take a trip down Hwy. 13 to Springfield some time around August 19, and check out the Supercar Reunion. The first 2 years, Glen Henderson has brought his '81 Yenko Turbo Z (
https://www.yenko.net/yenkogh.jpg ) to the show, and he has TONS of info on it! I think it would be worth the trip for you!
Hey Brian: is your dad plannig on bringing the TZ again this year?