Double check your rear width, you never know if it’s been replaced with the other size.
I don’t recall what rear I have in my 68 (converted to 5-lug at some point by the PO), but I measured carefully and went with a custom backspace through Wheel Vintiques. It’s snug as a bug with 5/8” clear to the wheel wells on the insides.
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I live in California, but identify as a Texan 
"If a job's worth doing, it's worth doing well"
Survivor "
Lil’ Mint" (67 c10 40k mile light green original paint)
Project "
C10 Fever" (68 factory black 396 swb)
Project "
Little Sister" (70 c10 blue original paint refresh)
Project "
Blue Bomb" (70 c30 blue original paint refresh)
SOLD
Project "
Vitamin C" (71 c10 orange original paint refresh)
SOLD