1969 Merc 1000 TOP Carburetor jets?

[68 Futura V153]

I've taken my boat up from 600' elevation up to a lake at 5000' elevation and obviously it doesn't want to idle or get up on plane very well. I'm thinking that I would like to try changing the main jet size on the 3 carbs but I can't find them online for this old engine. Does anyone know where I could look or what to look for?

Thanks in advance

 

[The Force power]

Welcome to IBoats :welcome:

Here's a link that you look for your motor & any parts needed

https://www.mercurymarine.com/en/ca...erm=en&utm_source=Overlay_IP=ca&utm_medium=us