Older Campy hubs didn't have a flip-up oil port. The Record hubs had a "C" clip that covered an oil hole in the middle of the hub barrel. Other Campy hubs didn't have an oiler hole in the middle of the hub barrel.

I think the Shimano rear derailleur would virtually work with any 6 or 7 speed freewheel (from your photo's, yours looks like a 6 speed) as long as friction levers were used. If you have an indexing lever and it works with your derailleur/freewheel setup, all the better.

Yeah, that's the pump peg that allows the pump to be carried under the top tube in a horizontal position. I usually use a strip of velcro around the tube and pump as a safety measure; so the pump doesn't come loose on bumpy roads.

I bet the "hi" in the final 2 letters in the word "Bianchi".

The cranks look to be "Ofmega". I believe that they were fitted to 'lesser' Bianchi bikes. I think they are original and are quite nice on your bike (I would be pleased to see them on my frame). I'm not sure if the rings are original but they do look good.

Thanks for the opportunity to look at your bike - I would like it in my garage.