Hydraulic lift valve option

I have a McCormick XTX 165, which has PFC hydraulics and I want to start using the auto lift feature of AoG for headlands. My question is which kind of valve do I go with to do it? The hydraulics are manual so my thought was to just use an on/off valve block on the implement and send hydraulic flow to it using power beyond. Do I use a CC valve block so it blocks flow when not being used and that is ok and the LS will work correctly? Or do I use a OC valve and let the fluid circlate but that sounds like it would cause the fluid to get really hot. Or would it have to be really expensive and be a seperate CC valve with LS port ran back to the tractor and hooked up? Thanks in advance

If your tractor valve is closed centre you will probably have to be the same on the other one