If you filled out your Profile, you would get specific advice, still wrong but specifically wrong.
You mention a Holley but not which one.
The Weber 32/36 is smaller than the Carter BBD you will doubtless be replacing but it has good signature at low speed and many Forum members experience good economy on a 258ci with one. It is a well made and tunable twin venturi progressive carb that has been around for a long time and has good technical support.
The Weber 38 DGMS and similair is a synchronous twin venturi version with slightly larger venturis. It is in reality about the size of the Carter BBD. You will not get such good economy or vacuum signature at low speed but it is a better match to the 258 if you are more interested in driving it than the economy.
I have two Weber 38 now and I am very pleased with them.
BagusJeep lives in Bali, the Land of Temples.
With a Jeep every prayer counts.
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys