Another C20 8-lug wheel question.

[derotoreut]

I don't want to highjack Rupdog's recent 8-lug wheel post, so I'm posting a new thread hoping someone can help.

I want to increase the stance on my '69 C20 by making it sit taller and fill the wheel wells, but want to make sure I have no interference probs. I am currently running 275/60-15's on all 4-corners from the PO. I like the width and how they sit at the edge of the wheel wells, but they're too short for my liking. Should I look at taller 15" tires for my current 8-lug 15" rims or change over to 16" rims?

I have searched a lot of postings but don't see where anyone really mentions backspacing on their 16" C20 8-luggers. I also see where some have used H2 wheels, but again not sure of the backspace and rim width. What you guys got?