That's one good thing about the DCOE's vs. the SU's, the SU's needed seasonal (at least) tweaking, to maintain a decent tune.
My first Volvo, a '68 142 with an overdrive badge, but no overdrive to go with it, had dogs for SU's. I fitted new throttle shafts, made lock nuts for the jets & got some lock nuts for the idle & choke speed screws & never looked back. Just add ATF to the dashpots & pull the chokes down fully & put on some moly grease during each oil change. I guess in an American winter you would need to richen them a couple of flats, but I think that got solved with the newer HIF6 carbs, although nearly every B20B I have ever seen has the cheaper Strombergs on them.
Also, your DCOE's aren't tuned 100% either by the way you describe them. They can run as well as your injection, BUT, given that you are so comfortable with injection, I would say to you fit MegaSquirt & forget learning the ancient art of carburettor tuning. Take the aux & main chokes out of the DCOE's & replace them with a length of aluminised exhaust pipe or a full length home made ram tubes & enjoy the sound of Webers combined with the joy of injection. Then you can go straight to experimenting with the intake length.
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