Well to start at the most important part of the whole thing is the fact that Baldwin Chev went out of business in 1973-4 era.
So no way could it be a Baldwin Corvette. The paint on the car is stock Vette in '81. I don't see anything about the car that makes it a Motion conversion either. Or perhaps the Holly and special valve covers make it one.
Seems like a nice guy that just doesn't know the real story.
Did Joel have a Son??? News to me?
Pantera