Hola Tony
I'll start with the design.
In 1962 the drift tube was still in effect ( usage ). This means the
carb did not have an vac port at the base.
The 1963 year was the design change due to mandated requirements. But
it has been a while since 1962 and pre-owners may have retro-fitted the newer
carb and etc on your car.
The 1962 intake manifold was the same part number until the finish of the
413 in Imperials. It was also the same intake manifold for the first
series ( two years ) of all 440's with-in MoPar. The base plate
design was known as the "sq port" since all ports/passages were of the same
size. In 1968 the "spread-bore" design was put into usage ( for all MoPars
that used the 4 bbl carb, except the -3 engines in very large vehicles ).
Another item to look at is the sq bore carbs are an "push to open" and the
spread bore has the "pull to open" design.
The CFM's are only about the 625 size on the sq bore engines.
I hope this gets you started in knowing what you want to know with
"carb-al-i-gly".
Rodger & Gabby
Colo Spgs ( COS )
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