The 340 is the biggest POS V8 Chrysler ever made.

That's one of the reasons I quit going to carshows, every idiot-expert/ expert-idiot, was running his mouth off, proving just how brilliant he wasn't.
I remember the early 70s well. Being a stocker,my 340 was not the quickest nor the fastest around, but it sent a lot of other "big-inch" cars packing. The 70/71/72 A's were light-weight powerhouses for their time, and if you could make the tires stick (no easy task), they could be like lightning.

While my fellow-highschoolers were hopping their cars up, I worked on getting the tires to stick. And whenever one of the boys thought he had it right, I was the guy to line up with. On the street,there was no way to make Polyglass GTs to stick, with stock suspension. I was so glad when the wore out. I was 17, and cash was tight, or I would have chucked those tires out the day after I bought the car. But a $1.50 an hour, tires were expensive. So I got me a job in a tire-store,lol. I bought that car in late summer 1970, and I sold that car in Feb/75. It was on it's 7th pair of rear tires. And second engine, and second 3-4/third 1-2 synchronizers,and second driveshaft, and second rear gear,and I think third clutch. That car was my 4-season DD, and it put on a lot of hard hard miles.
So was it reliable: you decide,lol.