Back on topic -

1) disconnect neg batter terminal for 5 mins.

2) while u are waiting, disconnect the ECU totally from the car.

3) afterwards, inspect the dizzy plug for any disconnected or burned through wiring. The wires should be soft and pliable (bendable). OBD0 swaps have been on the road so long that the dizzy wires (due to heat) could be getting hard/brittle and less conductive to electricity. Re-solder and re-pin any/all wires that have gotten hard.

4) inspect harness plugs that plug into the ECU. Make sure that none of the wires have fallen out of the pins.

5) connect ecu back to the harness, ensuring that you feel/hear the "click" from the tab

6) turn the key to "run" position (until the fuel pump primes) and then start. After warm-upm see if the car will rev over 4k rpms.. if so, FIXED.