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I have a 1971 16' Custom. I cruise around the shallow waters of the Laguna Madre in South Texas but also want to start fishing out on the gulf side. Right now, the boat has a 1986 Johnson 110. I have access to a 1985 Yamaha 90 as well.

Considerations:
• the Yamaha is nearly 100# lighter which may be helpful in the shallow water
• the Yamaha hasn't been run in 20 years
• I've put about 20 hours on the Johnson and the only issues I've had were fouled plugs so far
• I think my hull is rated for 90HP. I don't mind pushing the limits but don't like to push the limits in ignorance and I know nothing about the concerns of leaving the larger motor on the boat.
• I would like to pull my kid skiing as well

What I want/plan:
• I want a reliable engine and am planning on dropping one of these two off at the mechanic to have him check and replace everything that needs it. I can spend a couple $1000 but can't afford a new motor right now.

What are y'alls thoughts on which one I should go with?