For those who say 48 IDA's are too small and restrictive for the 351c, Shelby ran into that way back in 65 with the 427 Cobra. He did a project with Weber whereby he had 58mm IDA's made for him.
It is said that there were only four complete sets made, that they came in custom made wooden "jewelery boxes" and are serialized.
I know where one brand new set is and it is still in the original box. How you would EVER convince the owner to sell them to you though is beyond me. I'd say forge-a-bout-it. No chance.
Here is a picture of them on a 427 that is going into a Cobra. I don't know if this is in Venice or at LAX? Probably the airport facility?
Just because 58's "theoretically" were right for the bigger displacement didn't prove out in reality.
Apparently they didn't work very well, ALTHOUGH SUPERFORD magazine talked about a guy who showed up at a test track, uninvited" to a photo shoot they were doing for another car. That car was a real "street 427" with the 58mm mounted.
So that owner apparently knew how to get them to work.
It could also have been that Shelby couldn't get them homologated in time or at all and considering the expense of the set up, just dropped them. That happened a lot there and then.
Anyway, sorry for the departure and the side trip. I tried to make it worthwhile.
Here's some pictures of the 58's mounted.
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