The 340 is the biggest POS V8 Chrysler ever made.

How often do you have to work on the distributor? Once you have it set it should be good for a long time.

The oil pump is in the back because that is where the pick up should be. The shorter the pickup the better. Oil goes to the rear under acceleration. That's where you want the pump. And the pick up.
Alot. Changing advance springs, changing wires, rotor, cap,etc...and on the oil situation, that is what a baffle is for. Weird how big blocks never really had oil starvation issues...at least not from people running the pan dry on long, high rpm, high speed pulls. At the end of the day, both are opinions, and you know what they say about them....