Quick off- set question (lowered 69 fleet)

[Cole Trickle]

I know this has been beaten to death.....

I have searched and searched and I am pretty sure I have close to a handle on what I need.

I am about to order some 20x8.5 and 20x10 raceline wheels.

From what I have gathered I need 4.75 rear back spacing. (raceline confirmed)

I have been broswing 72 Black Beauty and N2Billets builds with the same size wheels and nate went with a 5.5" front back spacing and N2Billet did a 5.75" back spacing. (raceline suggested 4.5" front but I don't want issues and maybe they don't get that the ECE spindle will push the wheel out))

The truck will at the most have a 5/7 drop in the future.

I am going to run a 29" front tire and a 30" rear and I want the biggest lip possible and the wheel puched out bound as far as possible.

So do I run a 5.5,5.75,4.5?