Check out HR6: Age Of Heroes for D&D 2nd Edition, a sourcebook for roleplaying in ancient Greece.
GURPS probably has a suppliment, or several suppliments for Bronze Age as well. GURPS Egypt comes to mind.
Dark Sun (AD&D) had rules for stone, and bronze weapons.
One thing you might want to consider is having rules for parrying and dodging attacks instead of D&D Armor Class, since a cient armor was not that great. I believe the Chaosium systems have that.