Travelled in multitude of A, B and C models and never thought them to be noisy inside. Far more enjoyable than today's offerings.
As a diplobrat I seemed always to be seated just aft of the JT3D's. I wrote an article for listverse, which includes the engine noise at takeoff at No.9 . I don't own the copyright (I sold it) but you can view it at
https://listverse.com/2020/05/11/top...age-of-flying/
The food was better on Pan Am than BOAC, but I didn't get to fly Pan Am as often.
I was small enough in those days that if the seat next to me was empty, I could put the armrest up, curl up over two seats, and sleep, horizontally, on my side. I didn't get that privilege again after I'd grown until lie-flat seats came in.