67 notchback resurrection

Alright everyone starting to put some effort into getting this thing running. Went ahead and found a 3310 holley carb to replace the carter I had. Looking at potential buys for disc brake conversion in the front which would switch it to the 5x4.5 pattern. Looking under the vehicle looks like I have a 8 3/4 rear end since I have a drop out 3rd member. What would be my best bet for converting to 5x4.5 also? New axles or complete rear end? Have a rear end out of a 71 barracuda nearby available not sure if that would work .