Thats very true what Tom says , I forgot about that issue...I looked at Vintages website to see if if they have a delete for a/c cars.....it states there under Pontiac , Firebird :
"for non a/c cars only"

so you might call and ask them what to do if you convert from an a/c car.....maybe your`e just stuck w that factory air.....
just dont 'whine' when you change plugs...
or call Jim for help! lol