Cometic Head Gaskets

Well, I made a bone headed move and installed my cometic head gaskets and eddy heads and forgot to install the lifters. Duh! I had my heads all torqued down and then tried to put the lifters in, and well now I know you pretty much have to install the lifter first. Anyway, I've already remove the head on one side. My question is, are my cometic gaskets ruined, or can I reinstall? Please help.:angry7: