I like the concept of the Davis DUI but it is super tall with the big diameter cap sticking up way above the motor. I'd do the HEI conversion to a stock distributor before buying a Davis unit.

1972 Pro-Street 'Cuda, 500" Eagle stoker B Block, Eddy RPM heads, Victor Manifold, 850 Mighty Demon, Hemi 4 Speed, Dana 60 w/4.88 gears - Built by Hansen Racing Middlesex - NJ