Hub Center Bore Dia - New Rims on Old Hubs

[BBPanel]

I have a set of 2011 Camaro SS Rims I want to put on the front of a 50's Panel. Rears won't be a problem with a spacer/adapter. The fronts are another story. The hub center bore on the SS rims are ~67 mm. The hubs on the Heidts MII front clip, running I believe GM intermediate disc brakes from the late 60's, are ~78 mm. I don't know if opening up the SS rims is an option but I would rather replace the existing hubs. Trying to mount the SS rims leaves me about 2" from being seated - and it appears they would fit pretty well in that position. Another issue may be the spindle shaft length - distance from the rim mating surface to the center cap is only ~1", very short, and if I could seat on the existing hub the spindle would stick out beyond the center cap ~2" or so. An adapter/spacer to push the rims out far enough to seat would also see them hit the fender lip.
So, bottom line - need help trying to determine what spindle/hub combination I can use to accommodate the SS rims. This would also allow me to run larger disc brakes. Appreciate any help. -Bob