Decades ago Herb McCandless told me that the later A body Hooker fenderwell headers (the 1&7/8 ones, #5205 iirc) will fit if you mod one tube on the pass side. Speedway mtrs has a nice kit of 1&7/8 16 ga ex pipe bends to deal with that or your local muffler shop. I'll post a pic of the streetmaster mts. Problem areas: (A) trans tunnel (b) headers (if going that route) (C) small dia front tires required with fenderwells. (D) stiffen the chassis. No issues anywhere else & lastly you would use a "center sump" pan with the idler arm indentation. I even saw a pic of one with Max Wedge manifolds & it was a RB with the higher (3/4" at at 45 angle) deck heights so I would assume those manis would fit fine on a B. They would be heavy & are $1200 at Mancini (iirc) but would flow very nice with their shape & 3" outlets & as we know headers are a pain. EDIT pic added