*Puts on Moderator hat*
If this thread turns into another engine bashing thread, it will be instantly locked.
Ok, with that out of the way, it comes down to a lot of things. Primarily budget. So long as your 7M motor isn't a boat anchor (i.e. annealed head, hole through block, etc) it...
Just age and use. They're rubber so they can dry rot, and they can also be contaminated by oil pretty easily as well. I'm assuming you have the square style? Aftermarket is fine, but OEM generally lasts longer (much more expensive usually). There are upgraded ones too...
Compression check to test your rings would be another good thing to do...
Valve stem seals usually aren't constant like that, so you have some other issue. Could be a clogged oil drain on the turbo as well (turbos don't have "seals")
Hmm... where did you order the pulley from? Seems to show it as an assembly in the EPC. http://www.cygnusx1.net/Supra/Library/EPC/291420/catalog.aspx?F=8719&P=1
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