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Please try to help

I have exhausted all of my boat motor knowledge. ( It is limited to start with ) I bought a 1969 18 horse Evinrude, model number 18902d. This is what I have done to it.
New coils, new condensers, new points, new plugs and wires. Cleaned and put new parts in the carb.
Now comes the problem. It starts and runs at low throttle. It also runs well at home in the barrel. But, In the lake. It dies when I try to give it full throttle.As soon as the roller hits the cam, to activate the carb, it dies. If I give it throttle slowly it gets to that point and dies. Can someone Pease help me. I don't know where to go from here. Thank you very much for your help.
 
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