Heads selection help 5.9 magnum

So got off the phone with EQ. They sell a ch318a but it is not the new Zeeland head. The new ch318a has 165 and the old 175 runners. So it’s marketed as an OEM replacement that’s more heavy duty then the originals. Lower performance it seems.
Price was $349 bare and 450.87 assembled. The assembled has original springs so I’d go with bare heads new hardware.