Torn push rod seal; Replace head gasket and o-rings??

[Blane]

I'm putting together an R100 Frankenbeemer. I just got the heads on and everything torqued up a couple of weeks ago and noticed when I was installing the exhaust today that one of the new push rod seals was torn.

Now everything on the right side has to come off to replace that stinkin' seal. My question is, even though the bike hasn't been running, am I going to have to replace the head gasket again? Also this is one of those cylinders that requires a large o-ring around the cylinder and the 2 o-rings around the studs. Am I going to have to replace those as well? I just want to make sure I order everything at once and save on shipping.