Exhaust Manifolds #3418623/#3614368 Late 71/Early 72 Date Codes

I am looking for some nice,clean '72 A Body 340 Exhaust Manifolds. Casting #3418623 and #3614368. Need late 12 (Dec)/71 or early 01/02 (Jan/Feb)-72 date codes. Must have heater riser or at least not welded up holes and minimal rust pitting. Top $$ paid for the right stuff. Thanks again FABO