I don't know where all this talk about "high compression" motors is coming from, the 81 SC has a compression ratio of 8.5:1. Not high at all. You can easily do 6 psi on that and the engine will last forever. Plus it will get much better gas mileage and have better drivability around town because it is not a 6.5 or 7.0:1 engine.
If the kit uses a Rayjay turbo you probably should look into getting something a little more modern. You can have a flange for a Garrett, KKK, Mitsubishi, BW, IHI, etc welded to the header, so you can use a much more modern turbo. It would also help you get better drivability.
An overboost switch would not be hard to wire into your system. It is not a complicated device.
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Brett
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