Marvel carb on C-75--data needed

I would like to replace my Stromberg with a Marvel carb on my C-75 so I
can have a mixture control that actually works and can maybe get away
from a needle valve that has an unstopable leak.

Have called Precision and Continental and neither can give me a
reference showing where this carb is approved for the C-75-8, even
though Precision shows a carb number for it.

Does anyone out there have a Marvel on a C-75-8? Do you have the 337
paperwork approving it? Can you give me a copy?

Lastly, would such a change be aircraft type specific, requiring me to
find someone with the same carb on my type of aircraft (Interstate
Cadet) or is it just an engine mod?

Thanks