weld pro star/wilwood disc brake question

Hey Fabo, in need of your expertise once again!:) I'm looking to purchase 15x6 4.5bs large bolt pattern weld pro star rims. Anyone running these rims with wilwood disc brakes? Will the 4.5 back space be enough, or would I need more? The car is a 72 Dart with pst tubular uppers and 73 disc brake spindles. Any and all help is always greatly appreciated:)