help with a friends Cougar engine prob

I'm trying to help a friend out who owns a 93 3.8 Cougar.I got his car running this afternoon,but it is idling rough, and is leaking coolant out of the tail pipe. I'm not 100% famililiar with this engine but it looks like a blow head gasket, maybe? car hasn;t been in use for about a month. I want to help him out. If you think its a blown gasket, do you know of a good link for this problem? Thanks Jim
 
Hey thanks for the info,I'm just trying to help a friend out.He's a good guy who has a had a terrible run of bad luck.I called NAPA auto parts and they gave me a qoute of $139.00 for the gasket set and bolts,and $150.00 for the machining(some machine shop they use),seems pretty reasonable.Sorry about taking so long to get back,it's been a pretty hectic past three days.