Carburetor Question - Is this a good call?

80457-6 and 2706
List number 80457
revision 6
2706 is the date code and not important at this point.

List numbers can be looked up on a Holley List sheet.
https://documents.holley.com/techlibrary_carb_numerical_listing.pdf
The R prefix is used on many Holley documents. IIRC it indicates engineering list number. Bottom line, its the same with or without the R.
It's Model 4160 with advertized flow of 600 cfm, and vacuum secondaries.
its still available new, but only in silver coat. Holley 0-80457S 600 CFM Street Warrior Carburetor
As @yellow rose posted, it is very similar to the list 1850 carbs.
It can work fine if you choose to use it.
There's a basic instruction sheet on Holley's webpage.
Notice the first thing to check after getting the car running is the fuel level.