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Ideally you want to go to as small a wheel as possible that will give you sufficient brake clearance.
Radical SR3/8 run 200/580 R15 front tyre which is on par with a 205/50/15
I think the issue you may face is the Ph1 upper intake uses an idle control valve with the cable throttle, whereas the Ph2 uses the DBW to control idle.
I have to ask after seeing it a few times now, why do you want to block off the oil squirters? I would have thought the cooling would have been beneficial