I have an oppourtunity to buy an 89 corvette tpi plenum, and was wondering if there is any difference in it, from the camaro/firebird one we all use?

Also, what year plenum's work with an 89? I know they changed somewhat throughout their short life span.

 

There were three plenums, not car specific, year specific.
1985-1988 mass air/IAC port
1989 mass air
1990-1992 speed density

If you do a search there was a couple of posts with pic's and part numbers.

The 90-92 will work on your 1989, you will have extra mount holes from the map sensor and port.

 

Thank you.