If you are 1/16th plus on riser cut the 70-75 will work with the 220 head more than likely but I think you need to start your spine pack 60-65. I would opt for the 4 different spines with 3 arrows apiece. 60-64, 65-69, 70-74, 75-80 are the ticket.
It will also depend on your string material to0. If it is ff, start there, if B50, drop 5 to start.
+5-10 for arrow lenght depending on string material, + 5 for ff string, + 10 for heavy point. You are in that 70-74 pound range. God Bless