65 Valliant drum to disc swap.

I have been wanting to do 5x41\2" disc on my 66 valiant. Thought maybe I could price it together an save some money. You can get it in a kit for around 500.00 and I have about 800.00 in mine.
I saw this at summit. Classic Performance 6374SWBK-S Classic Performance 1963-74 Mopar Disc Brake Kits | Summit Racing .