getting some wheels, need advice on backspace

[pcmcobra]

I decided on some wheels.
20x8.5 on front and 20x10 on rear
I am not sure what backspacing I should choose. I don't want the tires sticking out, nor do I want the "front wheel drive" look.
Have not decided on tire size either.
Any tips or pics would be nice.
86 c10
and I will be dropping the truck, maybe 4/6 in the near future.

thx
John

[OKUMA111]

NO 20" OR 22" WILL STICK OUT ON THIS CHEVY'S I HAVE 22'S ON MINE I DIDN'T BOTHER TO CHECK THE BACKSPACING ON THEM SEE PICTURE.

[OKUMA111]

SORRY HERE IT GOES AGAIN ................i143.photobucket.com/albums/r150/OKUMA111/DSC02265.jpg

[Copper Canyon]

A 3.75" or 4" on the front would look nice, the wheel would be tucked just behing the fender.  The back you would go with a 5" to do the same.