Let Me explain.. 1989 Ford Mustang 5.0 Lx Convertible... Has A9p ECM.. has 5.0 ho mustang stock intake.. Has Mickey Thompson Valve Covers.. Has a Cast Iron Gear on Distribrutor.. Heads are E6 (has S on back) block is a 89 5.0 ho.. Firing order is 15426378... Trans is an aod.. has 1980 mustang...