[Jack21]

Like ScottJ said, the DUI (Davis Unified Ignition) is a Delco HEI ignition for Fords. I looked at one. Seemed a little pricey for an HEI setup although compared to a vintage Ford distributor, it's certainly an improvement. And for a Cobra it seemed a little too tall, and might cause hood interference problems. Don't know.

But I'm using the pretty much standard MSD Pro Billet distributor (which is also a Delco style dist), and MSD 6A and it works fine.