I'd move with a bit of caution. If & I mean if it was built by Eric then he would have built it right & possibly moved the barrel to suit what the tune was for.
1.4mm squish is still waay too big for 'optimal', but to go lower you'd have to lower the compression quite somewhat, so maybe that measurement is the one if chamber hasn't been modified to correct the compression ratio. They don't rev high so even though 72mm stroke you should be able to run them to 0.9 with the piston just before kissing, maybe 1mm to be safe.
If the head has been machined there will be exposed ally rather than the black plated std. This should indicate if the head has had chamber modified. If not then Eric hasn't touched it or they bought some bits off him, but he didn't tune it.
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