350 tbi needs a head gasket

Anyone out there give me a procedure to do this?I got this motor and the one head gasket was replaced but the mechanic did not do the other side.So a few months later the other side went.My pap just pulled the motor and dropped in a different one>Well i am gonna be getting that motor for my blazer but wanted to know if someone could give me some instructions.I searched and didnt find nothing and autozone did not have it on there site.

http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/08/5e/e9/0900823d80085ee9.jsp


After days of trying and no one responding autozone.com decided to work.So here it is in case anyone else needs it since no one else seemed to want to put it up