Another “which camshaft” post

chrgdrt said
something like a Comp 256XE Xtreme Energy 212/218 Hydraulic Flat Cam for Chrysler 273-360
or 262XE?
Xtreme Energy 218/224 Hydraulic Flat Cam for Chrysler 273-360

So are we constrained to the two original choices or not? I'm kornfrooshed here.