Welcome to the registry...
Kinda Biased toward the SSS system myself...
I bought a couple replacement cats from Late Model Restoration. They are on their site for @170$
Get those cut into your h-pipe replacing the two that are clogged would be a cheaper option then getting a new catted x or h....
I have an old x-pipe that i did that to. Worked out great...just have to find a muffler shop that will replace the clogged ones for you...