You guys are beating this "bubble top" thing to death! I've only heard the term frequently for the last 20 years or so on the vintage car scene, and understood that it just referred to the early '60s GM hardtops with the huge "bulbus" back glass ?
My dads buddy on the line, they were painters, he ordered a 62 bel air,409 4sp. they got to paint it. He street raced the car alot. Guess in 62 it was one of fastest out there.