Stirring the pot!! You will get a lot of opinions, both are decent carbs. I run a Holley 750 on my 383, but to be honest having been a boat mech for a long time I would rather have a Qjet on it. I have found the Qjets far more reliable, many will argue better performance with the Holley. If you mainly cruise you will get slightly better fuel economy with a Qjet. If you have a Holley rebuild it and you will be fine!
No matter what your beliefs are "GOD BLESS AMERICA"
Fully retired marine tech near 60 years in the biz.