Drop spindle question

All of the drop spindles out there at the moment are based off of the dimensions of the '73+ disk spindles, which have a larger bearing diameter than the stock SBP Kelsey Hayes disks. So, I would say that's a "no".

I know SSBC offers dual pattern disk kits that have both the large and small bolt patterns, but I think all of those are intended to work with drum spindles, not '73+ disk spindles.

And then of course, there's the small matter of drop spindles being an expensive waste of time. You'd be far better off keeping your stock spindles and stock SBP disk brakes, buying a set of 1.03" torsion bars, and using your torsion bar adjusters to lower the car. Since the larger bars will result in less suspension travel, you can "give up" some of that travel to lower the car with the adjusters.