I remember having a RB motor on a engine dyno that had aftermarket magnetic pick up distributor female plug that wouldn't plug into the Mopar ECU boxs so I adapted a Mopar type male mag pickup plug onto it and I didn't know the color code of the Mopar mag pick up versus the after market and of course I got them reversed. the motor wouldn't start on he dyno until I retarded the distributor a bunch.
Luckily the dyno operator recognize the symptoms and we fixed it, it was 40 crankshaft degrees difference in having it wired the correct way and having it reversed