Go poly for sure, treat your gas to be safe if your afraid of ethanol and you will never have a problem. Every gas tank I have done in any boat I've redone/repaired has never had a problem with poly (most I have done I know the current owners with all positive reports). Last one I did was replace a 55 gallon aluminum in an 18' Robalo. I fit a 50 gallon plastic tank almost perfectly and just had to get a little creative with the braces/straps to hold in place.
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