Well, your motor is unusual. You have a late model block with an early model head and cooling system. Plus, I believe you have won the "Most hose clamps on an A4" award.
You can get an idea of the options of motors combos by looking at
https://moyermarine.com/faqemorlm/ and zoom in the the photos to on the right. Your cooling system is the bottom three photos for reference.
I'm not familiar with early models, so I'll let the more knowledgeable handle mods. However, regarding question 4, I have the same Monitor HX and looks correct to me.