440 header question

If you buy Hooker Super Comp full fenderwell headers for a RB in an A Body, extensive modifications will be needed to eliminate interference with the front tires while turning. I had to reshape/relocate 6 of the 8 pipes on mine. After the mods were done, full lock to lock steering is possible with a 27" tall front tire on a 15X4 front wheel.

The ones you describe sound like ProParts Headers like Doug said.

Good Luck.

George