Frame Mods to fit 12" Wide Wheel on 1965 Chevelle

[BANKO]

Hey guys, I'm planning on building a '65 Chevelle with a custom width 9" and 3 link + watts linkage rear suspension. I also plan on doing mini tubs to accommodate the wider wheels/tires, however I realized based on Malitude that I might only be able to get a 11" wide wheel without frame modifications. Would it be better to cut the rear frame rails before the rear axle and weld in a custom clip as opposed to notching the frame locally near the wheels?

Thanks, Josh