tubs

So here is my dilema. I have a 1967 Camaro and I am replacing everything in the rear of the car (i.e. wheels, mini-tubs, rear-end, suspension). I don't have anything yet and I'm not sure what to get first. My thought was to get the the rear end housing and axles first then adjust my wheel...

At the front and back of my rear wells, some filler had come away and made itself known. So i decided to see how deep the rabbit hole went and now i'm left with a few questions before i really start to pull things apart. Is there usually fiber tape and filler along the length of the sill plate...