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I am looking at upgrading to a ta-49 turbo. Many have ported waste gate holes and I am wondering what size flapper I can go up to in a ported stock exhaust elbow? Also are there differences between the ta-49's?

Have an 86 GN 40k original, dut intercooler neck, 42lb injectors, tt chip, 255 lph pump, hotwire, kirban 100# valve springs. Thinking hard about switching to e85. Turbo needs rebuild and fuel pump probably should be replaced, chip was for 93 oct which I can't get near by anymore. 91 and octane...