Obviously opinion here... I like 55's best. I don't like 6V, and might consider 12V conversion. (Emphasis on 'might'.) I don't like continental spares. I don't like 57's, as I feel they are a little 'porky'. I agree with David, port holes are ugly. 312 rear main known for leaking.(Saw that in video. I don't know what's with that.)
Reading your comments about your likes and don't likes, it would appear that I have the perfect car for you.
I have a one owner '56 Bird that was bought as a 21st birthday present in 1956 for my late wives best friend.
In the late '60's the car was getting tired so the current husband of the own had the car modernized.
The spare tire carrier was removed, the bumper was filed to remove the exhaust openings in the corners. Fortunately the top did not have the portholes. A high performance '68 302 w/ C-4 trans was installed.
In the early '80's the car was in pretty sad shape, the owner, Patti, asked me to help her with the car, her husband had passed away so I agreed to take the project on to get the car back in shape.
Over a period of several years I did a complete makeover of the car, freshened the engine up, had the car repainted back to red and had the interior redone with stock type upholstery from NPD.
I have all of the original paperwork on the car, the title still has the original owners name (with mine) on it.
The car is for sale!