chirscraftmatt1976 - Your note about the new carb, "I'm probably going to replace with a different carb anyway. This one ***," didn't show the model number. Are you refering to the Holley 4150. I found a post from 2006 which had a couple reccomendatons... see below.
There are two options that will work on your application. The first is part #0-80559 (Holley 4150, 600CFM). This is a 600 CFM unit that should be plenty big for a 285 horsepower application, and will make your boat run like a FI boat.
The second option is part #0-9015-1 (4160 750 CFM). This is the 750 CFM unit, which is probably overkill, unless you have dreams of swapping cams/heads/etc, to create a high performance gas-guzzler.
You can find these carbs Vic Hubbard's marine shop for $449: https://vichubbard.com/shop/product.php?productid=61964