The Hooker blackheart i think they stopped making them i used the cast iron low profile for licencing with a 2.5" system then refitted the headers with 3"
They did stop making them for awhile, but they are listed again for the A-Body. You have to look under exhaust, they won't list them as "engine swap" parts anymore. Price is even close to what I paid for mine before they went up, and in stock.
Did you have to pull the motor to swap the headers on? I installed my PS header after the motor was in, but had to remove the DS header and manual box together. Doesn't look like it could be installed with the motor installed and a steering box bolted up.