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You might try a rebuild kit on the Strombergs before throwing in the towel. They are almost universally unloved, but they aren't totally worthless. In your case, it may just be a case of a leaking needle valve that lets residual pressure from the fuel pump overflow the bowls and put raw gas in the manifold.
But if they are not worth messing with, here's my opinion on the replacements:
Conclusion up front - if you don't care to read the reasoning: Get a nice pair of HIF6's.
1) Weber DGV - Needs a special manifold. This is a barely adequate replacement (in terms of performance) for a bone stock motor. Like most Weber's, it really doesn't have many adjustments, all tuning must be accomplished via swapping jets. Which isn't a simple task even if you have a kit full of different air correction jects, main jets, idle jets, pump jets. Which you likely don't. Which likely means you'll just bolt it on and live with whatever state of tune it came to you in.
2) SU's - The use the same manifold as the Strombergs. But they are just better built, better designed carbs. Not sure why the Stromberg ever came into being, since they are basically badly cloned SU's. HIF6's are the more modern variety, and were fitted on many B20 140's, not sure of the rhyme or reason to which models had Strombergs vs. SU's. They are slightly more difficult to tweak than the older HS6's (what was on most B18's) and flow slightly better (I've heard). Main problem with SU's is throttle shaft wear, bronze shafts turning directly in drilled holes in the alloy body - eventually it jsut wears away the alloy and lets air through at idle, and the unmetered air stymies the typical tuning method which sets the mixture properly at idle. But get a rebushed set, or an unworn set, and these are great carbs.
3) Weber DCOE's - Almost always installed in pairs on a B18/20. Needs a special manifold. This is a high performance option. They are really not worth bolting onto a stock motor. Like the DGV's, they aren't really adjustable in many meaningful ways, mostly involve swapping little intricately machined brass bits, only this time, in sets of 4. I have a set on the PV's motor, and they tend to be snorty and thirsty, but man oh man do they scream with the pedal down. There is very little left stock on my motor though.
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'63 PV544 rat rod, '93 Classic #1141 245 +t
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