what about DUI ? Simple .....

http://www.performancedistributors.com/marinedui.htm

I'm running a couple of those on NA motors. They are simple and work great (20 years, no problem), but they dont offer the multiple spark that keeps your SC motor plugs clean at idle. Not sure how easy it would be to hook up an MSD box with it.

MSD has pretty good instructions on their site. See link. The Tbolt IV V6 module with MSD works pretty well on SC motors, I would just suggest buying a spare MSD box.
http://www.msdignition.com/instructi...pdf?terms=6460

I wonder how much different the internals and coil are on the dui's than that of the numerous ones you see on ebay for under 65.00.

They're basically a copy of GMs HEI. My understanding is that pretty much all the parts are interchangabe. Gotta love parts availability with that.
The difference, "USCG approved". In terms of price, not much different from an OEM GM distributor. I've pretty much given up on buying chinese repro stuff for my 68 corvette, boat or anything else that can leave me stranded.

you have a lot of input from a lot of people,this is how i do it,and have had no problems for many years.i use msd distributor,and lock it out,blower motors like the timing even at idle.they idle much cleaner this way,i never have fouled plugs,even after long perids of idling.also,30 degreese total is not enough timing,that will make your EGT,S sky high,thats really tough on the exhaust valves.you need 32 at a minimum,i run 34 on my 540,s. at 30 degreese,you are giving up 40 hp or more.on a na asperated engine,i like the merc distributors, with the v6 modules.

Has anyone used the Mallory three wire distributor/ignition systems that have the ignition system contained in the distributor? They still use the seperate coil and seem to work well. We put them on my Step-dad's '83 377 Scarab. It started up fast, R'ed higher, and ran a TON better with the new distributors.


http://www.summitracing.com/parts/MAA-3748201

I ran the Unilite back in the day, BIG trouble with the advance mechanisim. Unless of course they have improved it.

the mallory 3 wire is the unilite, ran one with my blower motor and in a few others worked great..no issues...also running a DUI in my 509 simple works great, harder to taylor the advance over the mallory..Rob

I think you tell DUI what advance you need and they set it up ..m