Brake drum / wheel quandry

[stexag]

I found a donor '84 C10 and moved the front end over to my '68 for the disc brakes. I also moved the 12 bolt rear axle over to get the 5x5 wheel pattern. Unfortunately when I tried to fit my 15" wheels I found out the wheels won't clear the brake drums.

I know the axle is wider and I anticipated clearance in with the discs up front, but I didn't realize the rear drums would be an issue. Has this been an issue for anyone else? and if so what is the best solution. Thank you.