Approval for a Marvel carb on a C-75-8

[Forester]

I am looking at putting a Marvel carb on my C-75-8 and need to find where to go to get the approval for the change.

Precision lists a carb number but has no STC.

The TCDS lists only the Stromberg for the C-75-8.

I called Continental & the guy couldn't find anything.

This is for an Interstate Cadet.

Anybody have any approved paperwork they could share?

Anybody know where else I should look?

Thanks for any help you can give.

Forester