Sincere thanks to everyone for their input; it really helped prepare me for looking this block over! The main caps were not there, but I bought the engine anyways since there were no cracks visible between the valve seats and cylinder bores, or in the pan rails. The seller has promised to send them if he finds them, but I judge this possibility to be quite remote based on the diverse quantity of parts I saw!
605543F9-BD9B-40E3-9FBC-0A3CB26A7028 by
kenhenry_06268, on Flickr
Was not expecting a 3/4 cam! Someone must have had too many Wheaties before attempting to remove it. On the plus side there are adjustable lifters in it. Hopefully they were not ruined...
62C30A71-DBD0-42B1-8D2E-3381DF5871E3 by
kenhenry_06268, on Flickr