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you could put the Kleen system back on and put a filter on the end of the hose that normally leads to the airbox.
you do know that the reed valve type assembly that they are using as the Kleen system valve at the head only permits air flow in one direction, correct? I don't see how blocking that off could have increased your head pressure. From what I've read about the system, it simply injects/allows fresh air into the exhaust stream during throttle off conditions to lean out the exhaust gases to pass emission levels.
did you by chance remove that reed valve assembly under that cap/plate?
also, did your cylinder head gasket blow or your valve cover gasket?
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