I seem to have an oil leak coming from around the front valve cover. I inquired at Auto Zone about a gasket set and, according to their system, the valve cover gaskets are different between the */C and non-*/C engines. The price was quite a bit different too. I checked gmpartsdirect and if I read that right it doesn't matter which engine, but that part no. 12576033 is what I need.

Are the valve covers different between the two engines?

As a side note, AZ already messed me up with their system when I replaced the radiator on the bonneville last month.

I go to their online stores and look up parts myself to cross reference and ensure the right part.

I found that the supercharged and non-supercharged are different.

Fel Pro number for supercharged looks to be VS50465R and about $40 while the non is VS50080R and about $12

Thanks Bill, that matches about what AZ was telling me.

That'* roughly what I found out at NAPA also, so you're good to go, but you have to buy the SC ones for the Park Ave.