-87 78-87 78-87 68-77 65-75 71-75 78-87 engine 260-302w 260-302w 351w 260-302w 260- ... 260-403 283-400ch 283-400ch 283-400ch 305ch 350-403 400-455 400-455 260-403 ... 77-81 350-403 olds firebird-ta 82-89 305ch firebird-ta 82-92 305-350ch firebird- ... will fit angle plug heads factory chevy aluminum only must modify rotary air ... modifications chevrolet small block v8 engine stock replacement bolts directly to ... must use original factory big block engine frame mounts and hardware y yes n no ... models this header will only fit the 305engine without the optional oil cooler ...