Which 360?

Looking for a donor for my son's 70 Swinger. Spotted a couple at a local wrecking yard. one has casting number 3418496 the other looks like 1008830-360-1(had to stick my phone down in the engine campartment to get a picture because it's still in the motorhome) I think I decoded them to be one early 70's and the other mid-late 70's. Is either more or less desirable. The early one had a 2 barrel intake on it. Not sure what it came out of it's sitting in the back of a pickup that still has it's original motor in it. They want $200 plus a core charge. Does this sound reasonable? Seems a bit steep for a rebuilder.