Disc Brake kits for Early A's ??

If you keep your 1963-72 spindles, I think Wilwood is the only front disk kit which will get you to BBP (their hubs allow both patterns). I wouldn't try drilling your existing hubs to BBP since probably not enough meat left. There were 1973+ drum cars, so search if any were BBP (forgot), but even if true you would also have to see if those hubs would fit your spindles, plus those cars are very rare now in junkyards. Converting to 1973+ spindles is cheapest and you can buy new setups on ebay. Those hubs are integral with the rotor.