I'm not 100% sure, but I think it is a Carter design made by Webber. Two choices, Edelbrock makes Marine carbs, and may have a direct replacement. Holley does too, but it isn't the same style as you have now. Option #2 NAPA, should be able to hook you up with a rebuild kit. There may be an ID tag under one of the top screws with the number on it. Cheaper to rebuild, 100% less aggravation bolting on a new carb. All a matter of where your priorities are.
Gilly
1994 225CCR
TOBACCO Money