Some discussion and pictures (scroll down)
From the bit of playing I did years ago I thought the best solution was a 4K dizzy with 4AGE drive gear fitted. Then an adaptor plate to fit the dizzy body to the hole in the 4AGE head. I have drawings of an adaptor (that I never got round to making, so not 100% sure it works) that I can send if you're keen.
I wouldn't run locked ignition. It'll work, but (in my opinion) good ignition advance is key to getting good power out of an engine. Sure, fully programmable is better than a 4K dizzy with simple vacuum and mechanical advance, but that's still better than locked.