71 Demon 5x4.5" front disc swap questions

gotchya they would have to be damn near free for me to consider it as money is tight and I have the 68 spindles right now and a control arm is not out of the question but...

how about redrilling the 9" drum hat to 4.5" bolt circle think it has enough meat to do so(don't have one in front of me or to look at as it's on the car a 30 minute drive away ATM)? OR a small spindle drum hat with 5x4.5"BC

I was just doing a bit more research and seen Scarebird has 10" disc swap stuff for the stock 9" drum spindle using a Toyota Previa front rotor/chevy caliper -which Previa's are 5x4.5" BC