Amen to what Chance said. Reason is these hulls are extremely efficient, don't need a lot of power, and will plane at about 12 mph with a 300 lb motor! Moesly designed the 19/20' hull in the mid-60's for the lightweight motors available at the time, which didn't exceed more than about 110 hp and 300 lbs. If you hang a 500 lb 4-stroke on it, you will screw up the balance of the boat, raise it's min planing speed to the low 20's, and end up with a worse ride and handling than if you stay with the original configuration. Adding a bracket will make the situation even worse and require many other changes to get an acceptable ride and low speed planing performance.
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