Rear brake upgrade: 11” to 13”

[Kalums]

Post revive... Activate!! Ok I've got a full float DRW Dana 70 I a 71 GMC I'm currently rebuilding the 13" rear drums on from the ground up and I'd appreciate any help given. It appears to have GM hardware (alot seems to be missing, and to be honest the rear brakes never worked since I got it) Here is what I've got so far: 1)they never worked, except for the parking brake, 2) The wheel cylinders were corroded to high heaven and siezed solid... The part in the axle had an International Harvester part number on it and has a 1.25 Bore size, 3)shoes were cracked and about 2mms away from the rivits, I have no idea what the correct brake shoes are supposed to be. Every parts store including GM says it "should be either the 451s or 320s... But I personally I can't tell a difference in person and the PO loused up whatever shoes they bought to accommodate the parking brake by drilling an extra hole. 4) there was no self adjuster hardware on the passenger side... At all... None. The pictures I was able to find on here and the internet lead me to buy the adjuster kits (both sides). Now as I'm putting the Passenger side back together... Things aren't lining up IF I use the parking brake spreader bar...should I groove out one of the notches(it is only about a 1/4 inch off And I've given the parking brake as much slack in the line as I can)? Or should I buy a new spreader bar? This one seems really wide/long... Not sure of the correct terminology. I'm sure I'm forgetting something but Any help would be greatly appreciated.