Well, the "preparation" rules for a CACC car are taken directly from SCCA but the classes are not.  It is confusing, especially in the older cars that don't get listed in the SCCA rules. A simple answer is to prepare the C4 in either Improved Production 1 (IP1) or in Grand Touring 1 (GT1).

If you have the time/money/ambition you may want to spend it on GT1 because it allows more flexibility in various future racing endeavours. I built our first Camaro for IP1 which was less work and money, but when I built the next car, I decided to go GT1 because it allowed me the latitude to optimize the car the way I wanted, as well as more safety due to the fuel cell, fire system, etc. GT1 is considered the 'standard' for V8 cars in almost all racing organizations and therefore your car will qualify to race almost anywhere (NASA, ICSCC, SCCA).

The downside to GT1 is that unless you REALLY throw money into removing weight and increasing the power and handling, the lighter purpose-built tube-frame cars will always be quicker than your production-based one.

I'm sure others will have their input for you here too...
(Check the classes my car in legal for in my signature below)

Just been having another look (who needs sleep right?) and stumbled across IPE. It looks as if this would give me the option to run my already built motor / trans combination.

Any thoughts on that one?

Getting up to GT1 specs is going to over stretch the budget at the moment at least.

Your idea of ITE seems practical. There are a number of cars running in that class already although this is the first year for the class. The class is also run in different guises in SCCA and ICSCC (it may not be called ITE is what I'm saying).

Not to put down adivce from other quarters, but you might save yourself some confusion if you direct your question(s) to myself (michael_currie@telus.net) or Jim Kurtz (SCCBC Chief Tech Inspector). We are the tech guys and may be able to provide quick answers. And, neither of us race so we have no favouritism.

Mike Currie