I like my 98% stock 87 GT. My 88 GT was going to stay stock, but there were too many things wrong with it, so the engine, transmission interior were replaced. The engine is a 3.4, with a 440t auto and Mr. Mikes interior. I put a chin spoiler on the front. More invested than you can get out.
I also have an 88 IMSA wide body coupe with a ZZ4 V8 from V8 Archie. None of these cars can be sold for what they cost to maintain or build. Most all work that has been done on the cars has been done by a "professional" mechanic, although I did the Mr Mikes interior.
They don't get driven much any more, just to some car shows, which seem to be mostly several hours or days drive away.
The few times I get into them, they do bring a smile to my face as they are fun to drive.
It is a shame to take a limited production car or rare car to pimp land and screw them up.