When I bought my 1300/124 (2 years ago now), it came with a manifold mounted for a single DCOE Weber carb. Mahlon Craft, who I bought the car from, thought it was an aftermarket Faza manifold. I have not yet gotten to working on the car so can't verify what it is. I also have a manifold for 2 dual Webers. I don't yet have an original manifold for the Solex carb as originally fitted on these cars.
A few years back, I bought a performance cam from Richard Radford, formerly of "The Fiat Guys" in Washington. I've lost the spec's on it unfortunately. I suspect it is a reground cam. I just received a 1600cc OHV engine from New Zealand. I want to use this for regular street driving around here, and want to use dual carbs with it. I know this is not close to the original cars, but will be fun to drive with more power. The 1600cc motor will look indentical to the original "1300" motor. If I take the car to an important show (like the Concorso), I could swap on an original carb setup. I am still on the lookout for an air cleaner for the Solex carb. Someone in Australia was supposed to get back to me on one, but it's been many months since I've last heard.
I've never heard of an "S", "SS" or any other version. That's not to say Abarth didn't make one or two?
Gil Nicholls