I can't tell if those are hp500s, but i was talking about 500efi or 525efi twins. I know bumble bee was twin 525efi when it was 1st under construction.
A 28 w/ twin 496s does mid 80s.

mastercraft--- if you read my statement you'll notice that i wrote Bravo 1's--- not xr/xz's

Yes xr's are better matched but still are the weakest link in any of your equations -- not to mention if he's looking at single engine boats...