These cars only weigh 2700 lbs, There is really not reason to go 5 lug. Plenty of nice wheels. If you rebuild the brakes properly, the stock drums are more then sufficient. I never had a need for disc brakes. These are rare cars and imho should be left stock
I now have driving time on my Fairmont M/C with manual brakes and disc conversion up front, same M/C as Joe’s, and although it’s a long pedal I find it very acceptable with easy modulation and good stopping. No brace cutting needed, slight movement/grinding of the current relief for the M/C in the unibody frame flange, NBD.
Yes, long pedal, works good.
If you want get a Baer Racing “Remaster” MC. It’s short, ports on both sides, comes 15/16, 1″ , and 1 1/16″, billet alum, in colors, no brainer fit, larger bore will shorten pedal, and it’s about $400.