67 to 74 disc brake conversion, PLEASE HELP!!!

what wheels do u have now?

i run a 3/8" billet aluminum hub centric spacer on the front of my 17x8" wheels...as long as they are made of billet aluminum, and u have installed longer wheel studs so the lug nuts have full thread engaged, and are HUB CENTRIC, theyll be fine. ull have no worries.