Scott,
I think your biggest problem is going to be selling this to the Prod guys. We ran Prod and ITC in MARRS one year, and it worked fine, but many people whined about cornering speeds and car sizes. One Prod VW guy complained about car size differences, even though his model was IT eligible. Many drivers and officials were concerned about race tire vs. street tire cornering.
I found both of these to be non-issues, but some still complained.

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"Bad" Al Bell
ITC #3 Datsun 510
DC Region MARRS Series