The easiest thing would be to move batteries into the console if they are in the back now. Do you have GPH/MPG speed/RPM numbers for that sweet motor? People put twins on these all the time so don't get too hung up on single four stroke motor weight IMO. I think 20" might be a lot. I put a 70 gallon moved forward about a foot in my 20' boat and when it's full the bow is digging at idle or trolling speed.
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