Harmonic balancer help

340 Dart said
I just got this one in the mail yesterday, from Mancini, for my 73 externally balanced 340. I am using the B&M flexplate also.
http://chucker54.stores.yahoo.net/prostreet.html

Does the balancer come with a 360 weight as well as a smaller 340 weight for use with the respective externally balanced cranks?