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KEEP ALL OF THEM!!! I sold a certain car back in 1988 for a new vette because I was bored with it and been kicking myself ever since.So cover them for a while,and maybe you will be glad you kept them.
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In 1988 the prices had just about peaked.
You must have gotten top dollar at that time.
Could have replaced it whenever you wanted over the next 10-12 years.
Prices did not really start to climb until the "Turn of the Century"
I believe the outlook is the same right now.
Prices have seemed to level off, and I think they will fall dramatically in the next few years.
Sell your Z/28's to me, because I will take really good care of them.
Seriously, it might not be not the worst time to get out.
See what the economy does.
maybe next year you will wish you sold last year - maybe not.
I still like my cars more then the money.
Only you can decide for yourself.