I've got a 20' 1977 Tarva with a 460 ford, Berkeley jet, holly 750 carb.
Was out today with the family and  at 3500 rpm towing 2 little girls on a airhead raft and was at best going 25.
Motor seems good.  It's not over heating or smoking. 
Pump was clear when I got my hand in the intake.
What should I be looking at   
I know it's not gonna be the fastest boat on the water but she just seems dogging.


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