Help! Need info on 8 3/4 brakes

measure your drum width before you buy parts. if the brakes are original A body (which I assume they are since you said small bolt pattern) the shoes will be 1-3/4" IIRC. Some of the brake hardware will be different than the non A body 8-3/4 pieces, not just the shoes.
RockAuto should be a good source for most if not all of your needs.