set it to 10 degrees advanced if you ground that pin out and leave it grounded.

If you switch to the 63t ecu and harness, then all you have to worry about is wiring your distribtor into it as a cam sensor. Coils and power transistor will be plug and play on that harness. Now im not sure if the distributor will have the same type of signal as the 63t's cam. I've looked into the swap but haven't figured that issue out yet. I have the distributor pinout and know it sends a signal for top dead center as well as cam angle.