Where do I begin? You can easily change valve cover gaskets, if you need help just e-mail me. You don't have to get new chrome covers, I did that because the old ones were rusted out.
Yes, just unscrew the yellow cap and pour the oil in the opening in the valve cover. I still use a funnel, but it's much easier than filling thru the dipstick.
I have converted from R-12 to R-134a on my AC system, but all of the components are stock and original. They look so shiny new due to cleaning with "Scrubbing Bubbles" bathroom cleaner.
The blue tubing is simply blue wire looms that I bought at a car&truck show. You cna order those in any color from J.C.Whitney, Summit. or directly from Taylor Co. You might also find thos at the local parts store.
FYI, that pic is 3 yrs old, so I have more stuff added on. Things like the brake fluid cover I just painted to match my paint job. You see all of the rust on the brake booster, wiper motor, hood hinges, etc. and I spray painted little items like that, too. I am an engine freak, so every thing I can refresh, I've restored, replaced or repainted. It's alot cheaper than new chrome parts!!!