I hope that you are mechanically inclined, after stripping the engine down that far you will have to be very good or very lucky - or both.

Cleaning; find an old crock pot pour in enough anti freeze (full scale car stuff) to cover all of the parts and allow it to 'cook' for a day or two. {#1 you can never use the crock pot for food again, #2 do this out in the garage as the odor is reported to be toxic}

Do a search here of RCU for key words like Crock pot, Antifreeze and cleaning and you will see that this has been discussed at length over the years.

The parts will come out looking like new, now you have the pleasure to reassemble the engine.
Parts - after a while it becomes clear that it is cheaper to buy a new engine rather than rebuild it one piece at a time, your call. However; if you have a shop full of old engines you'd be amazed at what you can put together.