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You pose a good question. I am no authority on the SPICA injection system, nor have I owned a SPICA Alfa. But to get to your specific question, I have chatted with well qualified people who were in the loop and had good Alfa contacts at the time of the introduction of that system in the United States.
Alfa Romeo had to come up with a system that would function and meet the EPA emissions limits and in fact missed a production year in our market, 1968, during development of such a system. The SPICA system was originally used on light trucks as I understand, but was of a size that would adapt well to the 105 series cars. So Alfa Romeo made the expedient decision to test and adapt those pumps and that system to their cars for the USA market. They succeeded, but they realized that the SPICA system was not friendly to tinkering as many people like to do with carburetors. Indeed, the interior and cam mechanism of the SPICA injection pump is quite ingenious, and functions exactly like it was designed to do. But Alfa knew that unless they restricted service to qualified and trained dealerships, they were going to have problems with the cars in the field. Unfortunately that is what happened , and owners in some instances were not trained to start the cars correctly, or tried other starting techniques.
SPICA subsequently got a bad rap for being unreliable and difficult to service. And we also have to remember that there is a wide disparity in weather and climate conditions in North America as compared to many parts of Italy.
Fortunately, Alfa and some very good USA based Alfa reps persisted, and independent experts emerged with Wes Ingram being foremost among them. Today, the old SPICA injection system is no longer the mystery it was at first. I am not an Alfa racer per se, but I have heard from several well-qualified sources who do race that a well tuned SPICA system will generally outperform Weber carburetors on a 2 liter or 1750 Nord engine.
I hope this provides some insight, without some of the Alfa crticism that sometimes emerges when we start to discuss SPICA.
Just for the record, I do adore the sight of a couple of Weber DCOEs hanging on the side of an Alfa four banger! 😁
 

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I can't speak to the sticker prices, Lokki, but like GTA Alfa says the cars were brought into Canada both ways since it was the new American EPA regulations that caused Alfa to adapt the SPICA system here. A good friend of ours in AROC still has a 1968 model year 1750 Spider he in fact bought in Canada, and IIRC it has Webers.
 
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