I understand...I have been collecting 67-68's since 86 and again, your friends desire is a rare unicorn. Add a 350 HO 4 speed or even a 400 and you are talking about a car so rare to find for sale, that I would not even attempt. As I said prior, the color for one, is a small percentage of 18 colors offered that year...then add the 350 HO 4 speed...even rarer after 48 years.
Appears this isn't only about finding the color...It is all about finding the V code on the cowl tag AND a 350 or a 400 AND that is for sale. Unfortunately, that is a head shaker that even I would not dare take on.
Since the advent of the internet, I browse 67'8's for sale just about every week...just to see what is out there and possibly finding my unicorn. I have documented over 4800 67-8 Firebirds since 1998 that were advertised for sale or seen on the side of the road. Best recollection, 30-40 were Nightshade as advertised and does NOT include verification of V coded 68's that were repainted another color or the seller didn't respond to a request for Cowl plate tag data.
I will find one for a finders fee...I have quite a few contacts nationwide. I provide documentation and inspection of 67-68's only for potential buyers who require an assessment of a vehicle. I have also located specific cars for a fee. The fee varies based on time, effort and through numerous contacts. You can spend 10 years looking for a V code and not finding...or pony up a fee for someone to find it.
Or your friend could just overlook a 1/4" tall by 3/16" wide V stamped on a 68 cowl tag and save himself years of disillusion and money...and build the SAME car he lost the way he wants it...only thing stopping him is the V.
But that's just my opinion....
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.