Oddly matched cams and cam towers?

[Drumboxer]

I have a set of Heads and cams from a modified motor, and I'm trying to figure out where everything came from. The motor is mostly a '78 SC, here are the numbers:

Heads: 930 104 329 2R (I believe these are original)

Camshafts: 930 105 147 7R

Cam Towers: 901 105 111 1R

I don't have a book that will identify the last two by number, but those numbers don't seem right for an SC in my experience. Can somebody tell me what I have here?

Thanks so much, any help is much appreciated!