My marine guy got back to me and here is a 502 marine engine with part numbers and prices.
https://www.marineengine.com/parts/m...nd-front-cover

And the reluctor for the crank(#40) and the cam gear CMP sensor(#39). By the cam gear it looks like it is a 1x signal, in that case the CKP sensor will use a 24x reluctor.
https://www.marineengine.com/parts/m...k-and-camshaft






The CKP sensor you pictured since being used on a 4x reluctor, it will work with a Blackbox PCM.

peace
Hog