My carb is obsolete.. Please help me repair/replace!

I have a new-to-me Mercury 18hp 2cyl 2-stroke (I think a 1980'-1985') Serial N: 6414331
I bought this to use as a kicker for my 21' sterndrive, as it was only $200, and has electric start and a stator-rectifier system that was a requirement in my books.

I was told it sat for a few years, and it is pretty filthy, but was told it was running great when taken off the previous boat. So I'm currently in the process in of giving it a good cleaning/refurbishing. Already bought my water pump kit and new fuel filter, but now can't find a carb kit. After looking for a while, I read in a couple places that nothing is made for this carb anymore
The carb assembly is #:1384-8704A1
Carb Rebuild kit is #:1390-8676A13

I haven't taken it apart yet, but it HAS to be filthy, being with how bad the fuel filter and lines were. I believe there was one supplier that offered a kit, but it was over $100!!! Anyone know what my best bet is from saving this outboard as a giant paper weight? I always have liked rebuilding my carbs every 1-2 years for peace of mind. Am I screwed?? Are there any other carbs that I could replace this one with???

Thank you in advanced, everyone!

Boats dot net has it in stock part number 8153. I assume it’s probably pretty easy to get one if they have it. But if you want to. Any gaskets you might need can be made out of gasket paper pretty easily

In my opinion, nothing beats a good factory rebuild kit, thoroughly cleaned carb and reset to factory specs. Always worked well for me ! Chinese copy carbs were always a disaster and rarely worked.