I think variable valve timing should be severely restricted in all currently existing (hint hint) IT classes, if not disallowed completely.
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what are you trying to do, eliminate the ITS class altogether?

BMW 325 (of 93+ variety iirc)
99+ Mazda Miata
1994 + Integra GSR

are all cars off the top of my head that have variable valve timing in some form. and i completely disagree that allowing the adjustment of valve timing is the same as having an open camshaft rule.