1976 restoration 23'

[Marmaduke]

I was wanting some opinions on my 76 center console I'm restoring. First the transom has been redone with additional knees for support. A stainless marine bracket will be installed and twin 2003 yamaha 200 hp efi. The fuel tank will be 135 gal & moved forward. What kind of numbers will I be looking at for speed & fuel consumption, also will the deck drains still work in the floor?