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Johnson 1977 - regular maintenance

Hi everyone,

I'm a boater beginner, and to start I bought a jonboat with a Johnson 1977 35hp.
it takes some time to start, but it starts, and run just fine. I measured the top speed, and it's 33mph.
I want your help to know what I should do to keep it running smooth.
I bought a can of Seafoam, and I'm afraid to use. Should I use it in the gas tank? Or inside the motor, where?
Is this speed reasonable for this motor+boat?

Thanks a lot!!
 

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