I have not done a S197 yet... but plenty of Foxbody, G-body, Camaros, Trans Am, etc. Some R&R from the top (most common), if you have a lift then dropping the K-frame is an option. Whatever you do, be ready for the unexpected, so be patient. Also, you doing just the engine or with the transmission attached?
As already mentioned, definitely drop the pan and valve covers on the used engine especially if the mileage is unknown... Last thing you want to do is install an engine with an issue. Also, a good time to freshen her up and reseal it (oil pan, valve covers, front cover, rear seal, etc.) Taking videos, pictures and written diagrams or label taping plugs, harness, etc. is the best way not to get things mixed up.
Finally, couple of "competent" friends can be useful too in squirming the engine into place. You don't want to crush, pinch or damage anything on the removal and install. TAKE YOUR TIME!
Last thing, keep a first aid kit handy as the "Blood Gods" will want a sacrifice for your work! LOL