I did the same thing......only it was a 16hp briggs to a 40hp Kohler
Clutching: I bought a maxII secondary from Recreatives file:///C:/Users/Admin/Downloads/INVANCEANG_27722.pdf You will need to change yours because there is not enough room for the primary.[IMG]
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For the primary, I bought the powerbloc 80 they used on a MaxIV w/ the 29hp Kaw. I would suggest a open roller type instead....much easier to tune.
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Electrical: Your stock wires will work, they just need to be spliced into the correct position on a new plug.....and yes, the solenoid wire added.
Exhaust: I made my own.
Venting: I made my own....and yes it is important to get the hot air out of the tub.
Fuel pump: The stock Kohler work well, but I put on an electric one. I ran out of gas once (maybe 2+) and a suction pump takes much longer to prime than a push.
Motor mount: Drill new appropriate holes in the existing mount....and chuck those rubber things and solid mount it to the frame.