+1 With Mike.
I have a 95 2400 SCR that has a 5.7 A1G2 235hp and it works well.
The Max HP for a A1G2 is 300HP as I understand.
You did not state as to what drive you have, I think Mike has a Bravo drive in his 2400 SCR and he will more than likely respond again, He is very helpful and has a lot of knowhow.
There should not be a problem putting a 5.7 in place of a 5.0.
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
1976 16ft. Tahiti 2.5 IO (sold)