MSD Hemi 6 question

Quick question regarding MAP sensor plug.

I am running the hemi 6 box and Carb wire harness 04 to 08(#88864) I am also running my Fast EZ EFI system in place of the carb.

Do I use the MAP for the msd box or do I use the MAP for the Fast system?

My gut tells me to use the map for the Fast System and just get a dummy plug for the msd harness. let me know if I am on the right track

thank you all