Should be no need to remove the cowl.Take the three bolts out as Scott mentioned and you will have access to the arm nut, remove that and pull the assembly out as a whole.Reverse the procedure to re-install.
David
http://FirstGenFirebird.org/show/closeup.mv?CarID=571 If i don't get this car back on the road soon i'm gonna go postal! On a quest for FGF knowledge 1968 Pontiac Firebird Convertible 1969 Oldsmobile Cutlass "S" Convertible *Sold*