Your WH6 was made by Mercury in 1955 and should take Mercury fuel fittings. The WH6 is similar to the Mercury Mark 6 and probably has many parts in common, but not always.

https://www.oldmercs.com/category_s/121.htm

Info on your motor (Top entry)

It takes 3/8 pint of oil per gallon which comes to 6oz. per gallon. With today's oil you could use 24:1 ratio with no problem.

Thanks for the Info Bryan!

I did pickup the fuel adapters, so I'm all set there.

My next step is to tackle the lower unit. It is still factory sealed, so the impeller is most likely rotted (being 65 years old).

I did pull the spark plugs and they actually look good (they are Champion J7J, no longer made). I read on another forum to use J8C. Any thoughts on this?

After I get the impeller replaced, I'm going to attempt to start it. Keep you posted.

Thanks,
Fred

Here's a cross reference list to the J7J . J8C is a Champion substitute plug for it.