1968 Barracuda back space question

Daves69 said
Man, I here ya' there! I guess they didn't have the "auto jack" options available back then.:D

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I like a little rear end up in the air, wheel wells full of tire, but want them under the car, not sticking out .
I run 295 65 15 drag radials w/ about 1/2 to 5/8" clearance everywhere/front/rear/up inside.