what is a Dodge Shelby ?

Uh, 64's did not have 426's or 427's. First year 427 was 65 and it was a whole different car than the earlier 289/ 260/ 221 cars You are referring to an AC Cobra, right?
I'm sure your prob-lee right, '64 didn't sound right, but the kid keep saying a'46. I just swapped the numbers.