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The motors were options like:

Bearcat
Mercury Tower of Power
Evinrude/Johnson
etc. and in different HP.

Do you have the optional Ritchie compass?
https://www.whalercentral.com/photoga...hoto_id=36

What types of gauges are you considering?
Tach?
other?

Here are a few examples of OMC (Evinrude/Johnson) back in the day.
https://www.whalercentral.com/article...icle_id=43

Not sure what brand to suggest for you but other members here maybe able to let you know what they used on that particular motor if you are using the Bearcat.