According to wikipedia, the Firebird from 1993-95was offered with both the 3.4L V6 with 160hp, or the 5.7 liter LT1 V8 engine pushing out 275HP (only non california cars).
1993-1995 L32 3.4L V6 (or) LT1 5.7L V8
199-1997 L36 3.8L V6 (or) LT1 5.7L V8
1998-2002 L36 3.8L V6 (or) LS1 5.7L V8
So to answer the question, all 4th gen (92-02) Firebirds were available with a V8 option, but they were called Formula's or Trans Ams, but they are still Firebirds with a V8.
But it is true that the base model Firebird (the only one with Firebird in it's actually name) only came with either a 3.4L V6 or a 3.6L V6 for the 4th generation
Hope this info helps!