I really only know about the MOPARs (Dodge/Plymouth/Chrysler). I've lost count of how many my parents and I had, so this is first-hand experience.
They'll either take a small block (318, 340, 360) or a big block (383, 440), or a Hemi (426). (There are a few other sizes but those are the common ones). It's a pain to switch the K-members to change a small block to a big block, for instance, so get one set up for what you want to run.
IMO the six-pack (three two-barrel carburators, but *not* something modified by the ignorant) is the way to go on both engines. Very nice setup, but a little tricky to make work right with an automatic (stays OK once it's set up properly though).
Challengers, Barracudas, Cudas seem happiest with small blocks. They handle well for what they are. These are called "E-bodies". Sorta like the Chrysler version of the Camaro/Mustang
Chargers, Cornets, Roadrunners, Super Bees, GTXs, etc. are called "B-bodies" and FWIW I like them better (but that's just because I grew up in them). Roadrunners are fun, I always liked their simple, business-like nature. They never seemed all that huge to me, but compared to today's cars these things are pretty big and they're bigger than the E-bodies, that's for sure.
The manual shift ones are easy to drive and pretty sturdy. The automatics are good but have to be set up properly (beware of autos modified by the ignorant). Chrysler suspensions aren't bad for how crude they are (beware of suspensions modified by the ignorant). The brakes are so-so, which means terrible by today's standards.
BUT..big "but" and "sorry in advance" to all the muscle-car nuts

I've had a bunch of these things; my family had a lot of them new and I started buying/driving them when they were just a few years old. They aren't always as much fun as people expect. There are a lot of boring, modern cars that'll beat 'em even in acceleration (let alone handling and braking). Just IMO of course, but most of these things are more cool as historical artifacts than as transportation. A 440 six-pack in a Roadrunner *is* a nice setup though, and is pretty practical as a driver. Just make sure you really like driving such a car before you invest a lot in one.