I was going to comment what I knew about Collins' history, but then found this. Pretty well covers it.
http://www.dmctalk.com/showthread.php?t=8692
Toward the end, he lists the cars he would like to put in his garage to represent a "career retrospective". Interesting that he doesn't include the '64 GTO on the list.
He sold the Banshee to Bortz in the late '80s.