As long as the timing cover is off, grind off the tab at the very bottom of the passenger's side, below the motor mount bolt hole, to match the bottom on the driver's side. Do this in case you ever mount a belt-driven accessory (A/C compressor in my case) outboard of the passenger's side valve cover. If you don't cut the tab off the V belt going from the crank pulley to the A/C compressor will hit the tab.
Picture all the way at the bottom of this page:
http://www.pontiacsafari.com/L1Garag...ealUpgrade.pdf