need help badly... please help.

[riz]

I'm trying to remove the rear exhaust manifold bolt on the passenger side nearest the firewall and it won't budge. I've rounded it a little bit too but not too bad. I have to lean way over to get at it and then only have about a quarter turn of leverage if I do break it loose... I also can't hardly get anything on it due to the manifold pipe right next to it..... Please help! I want to pull my engine and wanted the manifolds off before I did so.

Thanks in advance,

RIZ