vortec, cam????

[68stcracing]

where can i get race ready vortec(both regular and bow tie) heads for a two barrel motor, what cam recommendations does everyone have, 1/4-3/8 mile dirt oval, 6500 max rpm pill, g-60 american racers(kk704)

[istock11m]

Sdparts or Brezinski on the heads. Don't know about the cam.