Comanche Heads ?

I just recieved a set. Dealer says they're "new", heads says "Remanufactured", WTF/wheres the fun ? Either way, you get to pay $150 ea., pita core charge. Reportedly, these flow 352 cfm @ .6" int.,stone stock. What needs help is the exhaust side. Valves are big, 2.140/1.655". Anyone worked on these yet ? Loaded in a 2,400lb, Hemi Healey roaster, should send Custer to his last stand. Onward, ateam.:burnout: