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Hello Chris,
What you are missing is a ability to tune the cold running and WOT performance mixture and still have the system correct to stoich for good mpg at cruise. Do you have the 80 CIS with the frequency valve still connected ? The system was designed to have the frequency valve pulsing in the middle of the range, with the O2 sensor signal trimming the mixture back to stoich under 35% throttle. If you still have the FV and it is not being pulsed by the ECU, the mixture will be very lean, and the mixture adjustment will have to be altered to compensate. This shifts the entire fuel curve. The best advice would be to test you AFR at cruise and see how far from 14.7:1 it runs. If you do not have a cat and do not care about mpg, you might not be missing much if you are happy with how it runs.
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Paul
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