8 lug steel wheel replacement options?

[Nevada51]

I'm looking at options to replace widowmaker split rims on a 62 C20. Happy to keep 8 lug (well, kinda!), and want a 16" stock look but without the split rim issues.

I know a 16x5 rim with a .44" offset (6 lug) was one option on c10's, so the nearest thing I can find (in 8 lug) are the options below (all 6" width and all with 4" backspacing):

http://www.ebay.com/itm/FORD-8-LUG-S...BV5yag&vxp=mtr

http://www.akhwheels.com/pages/showWheel.php?pk=711

http://www.wheelvintiques.com/wheels...ack-8-lug.html

My questions are:
1) Does anyone see any issues with any of the above options (scrubbing, hubcap fitment, etc), or does anyone have any other suggestions for 16x5" 8 lug single-piece wheels that would suit?
2) I'm not sure how to compare the 0.44" offset on a 5" wheel and a 4" backspacing on a 6" rim? More wheel on the outer face or behind?
3) The Coker Tire website says 650x16 bias ply requires a 4.5" to 5" rim, so will I run into a problem with a 6" rim (I know this is probably a question for Coker, but thought someone here may have experience with this).

Interestingly the wheels on it now are 15" split rims and I suspect they're early good n' proper widowmakers.

Any feedback would be appreciated.
Cam