Unknown Cam

I picked up a 72 duster that has a 1968 383. the guy i bought it from told me it has a "mild" purple cam but does not know the grind.(it was installed as a gift). I am looking at options for upgrading the heads but dont know how this unkown cam will affect my options.
First question is how can i check the cam specs? will i have to completely remove it?
As for the heads i am looking at the Edelbrock performer with 84cc chamber. Should i just plan on getting a new cam setup?