the only thing i can help you on is that you should replace all the glow plugs. That is what i was advised with my 83 300SD. do you really want to do all this over again if one of them fails? just replace them all and have peice of mind. Also, if the gasket is only a couple bucks why not replace it, again, it's not worth taking the time to do over again if you can prevent the problem now.
96 integra SE....sold
99 a4 quattro....sold
2004 highlander limited....current.