[Shotimes] Exhaust parts question

[Steve Tatro]

So, when I tackle my rod bearings next weekend (assuming I can amass all
the necessary parts), what exhaust parts should I replace?  I was
thinking it would be nice to replace all the y-pipe to manifold studs.
How about the y-pipe to cat-back?  How about any gaskets?
 
Oh, and are these parts for an ATX the same as for the MTX?  Obviously
the y-pipe itself is a different shape.
 
One more thing.  Any aftermarket vendors (NAPA, AutoZone, etc) have
these parts for sale?
 
Thanks,
 
Steve Tatro 
Red/Black '93 with 167k miles 
Cincinnati, Ohio