I heard nothing but good thing about those DUI systems, Check out TP Marine, he has them on his site for 305. Talk to Don he'll set you up 602-438-1361.

Yes they did.....To me one of the best parts of the system is that you can stop into any auto-parts store and get parts for it if you are in a jam......

We have D.U.I. set ups in our race boat, and each of our personal boats.
They work, easy to setup, tune, very reliable, and look nice and neat too!!

Do you guys happen to know if the DUI system is a multiple spark system at low RPM for good idling and non-load-up charactoristics? If not, how well do they work compared to an ignition box to keep the engine from loading up during long idling periods?

Also, can it be made to work with a Crank Trigger system/set-up???

No provision for multiple spark that I know of. They're a marine HEI. Not really applicable for a crank trigger either. But a very good unit!
Gary