Quick wheel fitment ? 20x8.5's

[chevychase]

Just checking with the experts first to see if these wheels will work on my '67 fleetside. Truck will have BB, 2.5 spindles, 2" drop springs and 6" rear drop. Truck is 5 lug with front disc brakes.

Wheel specs:
5x127 lug pattern
20x8.5
Offset +15 ( I measured 5 1/2")
C.B. 87.1 (????? I don't know what CB is)

Here's a terrible photo from my cell. Not my rim of choice, but they're brand new chrome alloys and my buddy is practically giving them to me. Anybody see any probs with backspacing or anything else with my mentioned trucks suspension and these wheels??????