Your cable identification is correct.The speedometer cable does not carry transmission fluid "per se." However, fluid can get into the cable. Also, both the speedometer cable and the gear selector have an O ring to seal them when pushed into the transmission. correct. You remove the shifter be...
vansauto.com lists an oil pan for 58-64 C bodies. There is no separate listing for different wheel bases. I can also tell you from personal experience that this pan will also fit a 1957 Dodge.
It gets worse. Mopar Mall wants $488 with a $250 core charge. I know how you feel. I need 2. Both the 1 in my 65 Monaco and the 1 in the 66 New Yorker are leaking.
collectorsautosupply lists 4x8 sheets of perforated headliner board, unpainted. There is no picture of the actual board and the description is not very clear. It is $316.97.
I recently put a 1965 361 with a push button 727 into a 1957 Dodge Royal. From what info I could find before installing it heater box had to be removed from the engine bay and the floor would have to be cut for it to fit. Installed the engine and transmission together. There was no interference...
I'm actually about to call them. I ordered sunvisors and cat whiskers for my 57 Dodge in February. The visors came. I'm still waiting on the cat whiskers.