Mercruiser general Questions

[AZSenza]

I cant for the life of me find this information so I'll ask the experts.

1. What year did Merc go to serpentine belts?

2. When did the Vortec Engines get placed into use by Merc

3. What is the Merc HP Rating of a 1997 5.7 EFI Engine?

I have TONS more but this is a good start!

Thanks in advance!