Follow the water is what you need to do. The water pickup is to the right in your picture, just follow the two inch hose with the green stripe on it and disconnect along the way. I disconnect both above and below the trans cooler and leave them off all winter long, then following the hose from the bottom end of the trans cooler the next "stop" will be the raw water pump at the front right of the engine. From there it should be easy. In regards to plugs, you should pull and drain a total of five plugs, two on the block (one per side), one on the aft end of each exhaust manifold and the last one on the "J tube." hope that helps.
'86 Comp TS6M - Reborn 2016
Riding a HO Sports CX Ski