Something up to gain that much with a carb swap. 2.5 tenths on a typical bracket motor is probably 50 horsepower.
I used to work with Patrick( Pro systems) years ago.
He gifted me ( to test) a 750, 1000cfm and an 1100 dominator, these along with a 1025 race demon I already owned. This on a well proven 9 sec small block.
None of the carbs..worst to first made more than 10-12 hundreds difference. 1025 race Demon I had and the Dominator led the way. I bought the dominator, sold my 1025 race demon( one of the dumbest things I have ever done) gave the two 4150’s back. Should have given back all three and kept running that Demon.