Why are you using the 2.2 heads? The flow very poorly. I guess they will be alright but are far from ideal. Are the the single exhuast port ones? The ecu will be fine with the increased compression it has been done before. The premium fuel may not be even necceery depending on what the ratio ends up being in the end. Remeber the compression ration is effected by differant heads and block combinations (when talking stock block with stock pistoins) not only the gaskets.
Joshua
This might help some though:
headgaskekts