That Mikuni carb is the devil! Finding a good remanufactured carb will set you back almost $500. I had the same setup in an '84 Dodge Aries. I got a new carb, and it ran great. Took about 17 psi of boost before I destroyed the engine.
If you do end up getting a new carb, clean up the old one and save it in a box. The carb's worth more than the car.
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"The genius of any slave system is found in the dynamics which isolate slaves from each other, obscure the reality of a common condition, and make united rebellion against the oppressor inconceivable." ~Andrea Dworkin
"If... the machine of government... is of such a nature that it requires you to be the agent of injustice to another, then, I say, break the law." ~Henry David Thoreau, 1849
That's right, bitches, TWO quotes!