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just some "positive" words from my side about the constant "bashing" to the Delco Dizzy:
The same type of Dizzy was used by Lancia in its Fulvia.
And Lancia egneineers were known not doing compromises, they always looked for THEIR best solution...therefore Lancias are often quite "expensive" to maintain cars, as they dont share lots of parts from other cars. (not Fiat, neither Alfa)
in the past i was a Fulvia owner...i used an electronic module from Simon BBC fo the Delco Dizzy...even the dizzy needs to come out and the drive-gear needs to be removed....its still a simple, straight-forward and quick job to convert from points to electronic.
this said: since around 10 years i have fitted such hall-effect kits to several dizzys, mainly into Ford crossflow engines and the said Fulvia....never ever had any failure or trouble afterwards...even not with those (cheap) electronic repro-lucas-dizzy´s from BBC.
and i´m quite sure that all those (cheap) electroic kits and the repro-dizzy´s are from asian origin.
so dont be so negative about the delco....
by the way: all the "italian" Dizzy´s from Marelli fitted to Alfa Giulia, Spider, GTV and Lancia A110, Montecarlo, Fiat 124 etc were sharing the same technology as the Delco:
Big rotor, underneath the centrifugal advance and underneath the advance, the points. so nothing exclusively reserved for the Delco.
I will rise to the bait. Apart from the fact points are tricky to change, my gripe is that on the 2 engines I have had in my posession (a TR7 engine I popped in my toledo, and my recent 1850) both had knackered delcos. Admittedly both engines had done significant mileage, the 1850 appears to have a genuine 110k on it (though the engine has been reconditioned, and obviously the dizzy was left)
The wear is in teh weights and pins. They become so worn that you end up with virtually zero mechanical advance. My old one was "fixed" by buying a cheap but new saab delco dizzy, modifying teh new baseplate to give the correct mechanical advance, and then playing with springs to get a sensible advance curve.
Or maybe I have been very unlucky with my 100% knackered delcos?
But my advice on any delco equipped slant 4 is to check the mechanical advance is fully working.
In spitfires they appear to fare somewhat better.