Wilwood makes a variety of different MC designs, so can't just say "Wilwood MC" in these types of discussions as this also needs to be qualified with a style type or part number. Smart of you to ask, as this obviously makes a huge difference.
The Mopar type with the plastic tank:
Front port = rear brakes / Rear port = front brakes
http://www.wilwood.com/Products/006-...IRMC/index.asp
The new aluminum tandem design:
Front port = front brakes / Rear port = rear brakes
http://www.wilwood.com/Products/006-...TCMC/index.asp
If you dig deep enough in the Wilwood tech links above, you will see this info listed.
