Thanks, Original 4 piston front brakes are not even on the table.( hence the poor mans front discs) I will use my stock drum spindles and they don't need any modification.
I think i will end up using this kit https://scarebird.com/index.php?route=product/product&product_id=67 I need to confirm but i think this kit makes the front track width a bit narrower instead of moving the offset outward like other kits. I had stock single piston nova front discs on my 67 BBC camaro i used to have and i was impressed with the stopping power.I assume these single piston small rotor kits should be close in performance and good enough for me. Certainly better then drums. As far as separating my worn out drums from their hubs my research shows normal style rotors are much cheaper then the one piece i need to buy for this kit. I will probably not waste my time trying to separate my hubs but we will see.
So all this disc upgrade idea has come as a result of trying to get my crappy drum brakes to work again. The front left i ended up swapping the whole backing plate assembly from my other sub frame after the wheel cylinder blew. Why not buy a new wheel cylinder? Simple, i do not want to put any money into the front drum brakes at all, i just wanted to be able to move this parts car around the yard safely. And some kind of front disc upgrade was always in the plans . Now onto the front right side. This side was even worse with another seized wheel cylinder, Drum is worn thin, and the wheel bearing was dragging badly. Since my other sub-frame is now under the snow this side will have to wait. All the brake-work i do will eventually transfer to the other shell. So I found my self looking at the crappy header on the passenger side.