to really do what you want to do you need EGT, wide band oxygen sensor at minimum and in the ideal case..... a set of eight spark plugs with fast reading pressure sensors embedded in them
Before using stock cast Magnum heads on a high compression and lean air-fuel engine set-up I would "temper" them in an non-oxidizing atmosphere oven at 520 degrees F for 24 hours, and then polish over the sharp edges in the combustion chamber.