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The 123 is, I think, the ultimate you can get in a distributor. and the programability (whether from your phone or plugged into a laptop) gives ultimate control over your advance curve and guarantees it's always right. It's several hundred times better than bobweights springs and a vac advance unit in terms of accuracy, so far less chance of engine damage from dizzy faults (like holed pistons) and will work with robot like efficiency forevermore . More efficiency means you get that rare double, more power AND better fuel economy!
And THIS is the real point and advantage of the 123 over ANY other EI system. ALL the others only make the spark, they don't have any effect on the advance management which still depends on the stone age bobweights and springs.
As you say, it's not cheap and complicated by there not being one actually made for the Sprint's 44D4. So you have to make it up as you go along. Fortunately for you, others like Mash and Jeroen have done the donkey work to develop it for you.
Which is why, if I was doing it, I'd be looking at a crank sensor, EDIS and coil pack.
It's a shame you can't scrap the dizzy entirely, but you need SOMETHING to drive the oil pump!
Steve
EDIT, YES £600 IS pricey, but a fully reconditioned and uprated 44D4 from the Distributor Doctor is closing on £400 now and that still has bobweights! Something to think about!
To me one of the joys of a classic car is its simplicity. I can service a standard dizzy on the bench, freeing up bob weights and making sure the vacuum advance is working is not very hard. Sure SU carbs and mechanical dizzy advance isn't as good as modern systems based on sensors but if you want that, just buy a modern car.
Besides which, modern systems as hardly bullet proof. Trying to find out which sensor is out of spec and causing power loss on a modern is no fun. Especially if the fault can't be picked up with a standard code reader. Neither is the bill for replacing said sensor when it has failed.