Holley/Demon Carb stumble

I don't know!
I thought you were using this with a profrom 750 main body and I noticed they posted this base is a for larger body.
I wish they would just post the dimensions on stuff like this. It would make things a lot easier.

FWIW, Holley's 3310 and 4779 '750's have 1 11/16 " throttles:
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View attachment 1715373151
Yup and yup :)