Mel Bunnell Chevrolet was located at 373 E. Pomona in Pomona, California. Their old phone number was 622-1136. Milford O. Bunnell who helmed Bunnell Chevrolet into the 1980s was later president of Enterprise Chevrolet Inc. on 1079 West Foothill Boulevard in Upland, California which is a bit north-east of Pomona. The Foothill Blvd location is now home to MOUNTAIN VIEW CHEVROLET.
Pomona upholstery is still in business . A review mentions an old guy who I would imagine is the same person who did tunnel pad and installed fire suppression system back in 75.
https://pomonaupholstery.business.site/Speedway built the floater rear.
http://1speedway.com/?route=common/homeDick Guldstrand did the suspension work, the roll bar and installed the panels. I would imagine they had experience working with fiberglass being a corvette guy. Dick Guldstrand is dead - company is dissolved. He has living relatives
Jim Davis did the paint and his crew did the gold leaf. Jim Davis custom Automotive - Jim Davis was A NHRA champion in 69. He built Dragster chassis' custom cars and bikes. He died in 88, his son (also Jim ) also died in a racing accident. I am sure he has relatives but there are a lot of Davis's in the phone book. I found a Don Clar who was a long time worker but he is dead too.
I am pretty sure I found Dan Bruno's daughter. After messaging back and forth, she asked for my number and said she would answer my questions. I think Dan is still alive. (He had a brother who died in 2014 - I think they are the Australians the body shop you bought car from were talking about). You might even get to talk to Dan Bruno yourself.