I'd sell what you've got and start a fresh, dropped spindles, Porsche discs & drums
It should sell quickly & you'll probably come out even
Probably correct . . . list the "empi wide 5 front discs " for sale someplace and get a disc set with the Porsche pattern. There is a set that will bolt on to your stock spindles.
Four-lug drums fit an axle with a broach length approximately 5/8-inch longer than a short axle's broach length. You'll have to make up the difference with a spacer between the drum and castle nut. It's been close to 20 years since I done that so I might have missed something.
Unless I'm wrong, the spacer would be required in the opposite case . . . early, wide-five drum on a late, long-spline axle.
new drums are available with the porsche pattern. When I purchased my new drums, I had to pay $10/drum to have the hubs turned down to fit the short splines.