You can re-index the ring to 50 deg BTDC if you want to run a generic delayed spark ecu. The Buick system is predictive spark and will work just fine with the stock setup and a distrib, as long as you have a points output for your MSD box and the crank signal makes it to ecu properly. The DFI should too. Maybe you could try telling it that the system is a Ford TFI, if the Buick setting is lacking something. The only other thing to do would be to verify with a scope (or even voltmeter) that the crank signal is making it at full amplitude to the ecu pins. Beware, if you simply pull the CCCI module out and just run a wire from sensor to ecu pin, it won't necessarily(!)
TurboTR
TurboTR