Depends on some details but I can't run WOT with a 100 hp outboard on a 20 with a t top and 40 gallons of fuel unless it is pretty flat water. I removed a Yamaha 175 2 stroke to put on a Yamaha 100 hp 4 stroke to get the outboard under 400 lb. I will fly the boat off the tops of chop in buzzards bay at 3/4 throttle most days. The 20 is pretty light.
If I can ever kill the F100, I'll go with an ETEC 90 at low 300 lbs
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