How much work is it to put a 28X10.5 slick under the rear of a E-Body

Mind is a 70 gran coupe with SB, Auto, and 8-3/4.
Have SS Spring so it has the perked up ass end.
Really don't want to do leaf spring relocate or mini tubes if i can get away with it.

running a 8" wide rim with a 26/10/15 slick right now but with my new 4200 stall converter, it just not enough traction any more.

It's still a full body car that i don't want to go cutting into, if i don't have too.

Any one snuck in one of these slick with minimal grinding?????
And if so, what did you have...

How much work is it to put a 28X10.5 slick under the rear of a E-Body
Author: Cudafever