Steve Strieter on the west coast owns one of Hamburgers SS cars. He's known as "topside" on moparts and here is his website showing the car in it's current form.
http://topside.info/
I use to buy Hamburger's stuff in the '70's and possibly into the '80's. Still have a few catalogs and the small "For 340's & 360's decals". He seemed to be the best source for Mopar small block stuff back then.
I had a Challenger back then and ran one in brackets till 1998. But A-body Mopars are "efficient" race cars and I got my current one for IHRA Stock in '99.