Drum brake size change

Jumping in here because I'm doing something along similar lines and need some direction.
My Barracuda was originally a SBP 8 3/4 and I've acquired a BBP 8 3/4 with 10 x 2.5 inch drums/. I am going to need to completely rebuild the brakes, replace the slave cyl. and the drums, and need all new brake lines.
Where is the best place to go for these parts and/or what is the equivalent Mopar I can tell the counter person I am putting them too?
TIA