Hi - I'm installing a crate motor in my son's 1995 firebird with a 3.4L V6.  The lower intake manifold gaskets have different sized restrictors on one of the coolant ports.  Can anyone give me some guidance as to which gasket is for the right or left side?  I have a picture from of the old engine and it appears the larger hole is on the left, but the gasket has a R stamped on it.  The other gasket has O stamped on it.

 Any help would be appreciated.