Need some disc rear end swap advice on a 2wd

[tnamarine]

Sent the blazer off to my fab guy today to get my air ride and a few things finished and noticed a nice puddle of gear oil on my garage floor when I pulled it out. Turns out I have a crack in one of the tubes where it meets the pumpkin on the rear diff.

I'm thinking it would be a good time to do a swap to a rear end with disc. Recently added a Blower onto my 396 and I could use some extra stopping power.

Anyone have any advice as to what may fit under the rear without having to shorten it? I was thinking possibly trailblazer SS or Impala SS may work but i havent successfully found any info on this.

Any help would be appreciated

Thanks guys !