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Being mid 70;s carbs, they are likely 4300 series carbs.

The 4100 looks like two motorcraft 2V carbs welded together back to back. The 4300 looks similar to a quadrajet, but may or may not be a spreadbore.

4100 carbs are awesome, simple carbs that work very well on streetwise small blocks.

4300 series carbs are quite literally JUNK. The only value they have is for restoration purposes.
 

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yep, those are 4300 series carbs, and they are not very good. they can be made good IF you know what you are doing, but otherwise dump them on a restorer.
 
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