RHS pump gas 360

Rat Patrol said
Brian another question; -

Hypothetical build : Lets say we have a Factory unported head (587 cast) 10:1 360 with a [email protected] / .520 lift cam, SP intake suitable ignition and carb...........

Which heads :

RHS 1.88 valve, or
Eddy

....will show more HP improvement straight out of the box - with NO work ?
Click to expand...

Which out of the box RHS (assembled) head are you talking about? I believe IMM builds their heads from unassembled RHS castings. Are you talking about an assembled head directly from RHS? or companies like IMM that make their own packaged head assembly using RHS basic castings?