The question, "which way does the radiator support go ?" comes up quite often.  The support plate is almost symmetric, but not quite.  The large holes, through which the radiator fits, are located off-center.  They are designed to be biased toward the rear of the engine compartment as shown here:

 

The front and rear faces of the support plate are somewhat similar, but the vertical flange on the front face is narrower:

than the vertical flange on the rear face:

 

The importance of using the correct orientation for the radiator support makes itself known when you go to install the bonnet.  Remember, the forward edge of the bonnet is located by the top of the radiator.