I usually read these reference books.

1987 PONTIAC FIREBIRD Service Manual
(General Motors)

1982-92 PONTIAC FIREBIED Parts and Illustration Catalog
(General Motors)

TPIS INSIDER HINTS
(TPIS)

CAMARO & FIREBIRD PERFORMANCE HANDBOOK
(Motorbooks International)

PONTIAC FIREBIRD 1982 thru 1992 ALL MODELS Owners Workshop Manual
(J H Haynes & CO LTD)

FIREBIRD 1982 to 1990 Repair Manual
(CHILTON BOOK COMPANY)