12 FT Tunnel Set up Help Please (Scat-Cat)

[01allison]

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Help needed for set up - please
Engine size and steering cables and helm recommendations
This is a formal Grand Prix boat with center steering - looking for speeds between 40-50 MPH - only thing I know is to have a 20 inch long shaft engine.
Data plate reads 25MPH limit to 289LBS limit - been told HP limit and weight capacity can be re-certified by US Coast Guard? Thinking about 35-40HP engine - known these boats were raced in the mid 80's -
12FT Long
5'9 Width
21 Inch transom height
200LBS
Does anyone know anything about this?

Thanks
Formal Allison Owner!