Unported head quickness?

Never had a set of heads I didn’t do something to. Challenger went 13.50-13.60 with stock heads stock valves hp manifolds 440 six pack e body. Only did some bowl work 452 heads no port matching, 2.18 1.88 valves, 11.90 headers, same gear, fresh engine.
Dart had several holes on the intake ports I had to repair on some j heads from day one.