These are all questions that could be answered very easily if you made a small effort to research them:
Wikipedia Article on the LT1
Dragtimes search result for 1993 Camaro
LT1 Iron VS Aluminum heads
This literally took me 10 minutes to find all of this iinfo and read to make sure it pertained to your questions. The search function on this board exists for a reason. Google isn't so bad, either.