Holley 1920 VS Carter BBS

I have a 1971 Plymouth Duster with a 3.7 slant 6 that currently has a 1920 Holley carb. I have rebuilt it in the past and it is now leaking again. I was advised that a Carter bbs might work better for me. I am looking for any opinions on both carbs and which is preferred based on personal experience. Also If I do switch to the Carter what else would I need to change in order to transition.
Thanks for any info.