You have the wrong dizzy...I had the same problem. There are two types, my points dizzy was shorter than my electronic dizzy.
the clip for the cap also hits the injector.
I did end up using the shorter dizzy but modified it for hall effect for my original fuel injection setup.
I cut off the vac advance so the dizzy would spin around more and cut off the slotted bolt hole on the bottom and used a 4K dizzy clamp to hold it in place.