Checked the rest of the casting numbers for you, it seems to be a 1957 392 out of a Chrysler 300. So, dual quad, solid cam, adjustable rocker set up. Best of the best. Heck even the dimpled "Chrysler Firepower" valve covers sell for twice as much as a normal set.
But you're missing almost all the good parts. The solid cam and adjustable rocker set up by themselves are worth as much as the rest of the engine. The heads you have are 1957 392 heads, which are good but not as valued as the '55 354 heads, they have a "555" casting number and are the best for flow.
Honestly, a 392 block, heads, and crankshaft with all that other stuff missing and the rust that's present is not a steal at $2k. It's not a bad price, but it's not a great one either. To return it to original form with just its original rocker gear and cam would cost several thousand dollars. The missing main caps are less of a worry IMHO, guys replace those all the time anyway for the cacklefest and nitro hemi builds, so an original main cap set isn't all that hard to come by. And I know guys in the early hemi crowd that have literally just swapped main caps and run them. Not what I would do, but it's not unusual for an early hemi with swapped main caps to work just fine with just a line hone, not even a full line bore.
Depends on the application. Some of them got adjustable rockers, which are worth a ton. Some didn't. The 4 bolt exhaust manifolds are sought after too, and worth a bunch. The only thing is that some of them got different heads, which are not sought after. The water supply and crossover are different. Not a big deal on most builds.