Cylinder head discussion 340 with stock above deck pistons

I would not buy open chamber Eddys required to clear your above deck pistons because later if you want to build a zero deck piston with ideal quench then open chamber heads wont allow you to get the quench. Maybe closed chamber Eddys or Trick Flows run thicker head gasket to clear pistons. But then might need thicker intake gaskets to make it work.

Aluminum heads chop massive weight off front of car thats a huge benefit.

Now back to the your car should be faster you don't need heads discussion....