Magnum replacement heads?

AWh...yes of course.....360 Dart with Speedmaster heads runs 10.46 @ 125 two weeks ago in Bakersfield....
Got a couple more ported but no engine to put them on...Stock/Super Stock engine builder ported them....
Said he was impressed..but what he know...

Brian at IMM ported these...

As always I provide documentation or video....can load the video if you like...