Happy 4th of July fellow Mopar heads!

I am mocking up the rear axle housing of my pro touring '72 Satellite project. My new wheels are Show Wheels Streeters. 20 x 10 rear and 18 x 8 front. They are Awesome wheels! I plan on putting 315/35/20 tires out back, but need some advice as how low I can go. The rear suspension will be a custom fabbed coil-over 4-link. If I position the axle housing where I'd like see the top of the rims above the wheel well opening, the top of the axle housing is only 3 inches below the frame rail. The rubber stop on the frame is 2'' tall... leaving only 1'' of suspension travel. Is that enough clearance? I've looked for pics of other P-touring Mopars, and no one is notching their frame rails in the ones that I have seen thus far. HELLLLLLLP!!!!

Thanks!

P.S. I wish I could post some pics, but I'm having computer issues. I hope to solve them soon and start a build thread to show case what my brain causes me to do with power tools!