Just delivered a customers CJ7 that I built/installed a pair of D60s in, and got 100" wheel base by doing what you're after. The trick was moving the steering box forward 1" also (MORE, kit). 2.5" out the front 4" out the back.
I used the Genright ext tank and Stretch armor kit. It looks stock except for the SRS, SOA, 35" tires and d60s.

Worked out well.

SD