20x10" -> 5.BS, 5.25BS, or 5.5BS?

[sighlurr]

I realize there are over 3 pages of threads for BS, backspacing, and wheel offset. But, for the price of special order wheels, I'd like to feel a little more comfortable with what I need for the rears.

I've got a '68 SWB with the stock 55.5" rearend. I'd like to order a pair of 20x10's for the rear, but need to make sure they'll tuck with no issues. The truck will be a static drop using Nate's coilover kit with 4 link in the back. I'm guessing it will be close to 8" of drop in the rear at ride height.

I plan on driving this thing pretty hard in the turns, and will have some tire flex from time to time. It's not important to me to have a wider lip, clearance is my concern. Is 5BS safe, or should I consider 5.25BS to be sure to clear?

Thanks in advance for your help!
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