Matt, I can’t help with who can do it for “free” lol, it’s not hard to campaign a car for some form of sponsorship though.. Just do a business plan, but for a car. Your dads companies will help HEAPS, has they aren’t small, so work shops could see a benefit coming on board even if all you dad does is just put stickers on the car.
I just used the Silvia, Porsche and my R32 as “pulling power” to get interest… mainly. The R32 was easier then the Lexus, but was still do-able, the unknown worried a few people, as no one knew how the package would work.
AB Flug built a TT 2jz 6 spd Celsior years ago, which worked, ended up running 10’s….