I own a 1991 Camaro is it possible to convert it to look like a 1990 or 1988 Pontiac Firebird?
You can but for the money that you will spend doesn't make sense for a car that old. You are better off just buying a 1990 or 1988 Firebird...
No- it is not possible-
Search Chevrolet Camaro Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Camaro Experts