K2 on case halves and cylinders at the case. Anywhere else?
>>>>>> no
T only around 4 lower head washers? not really sure what you mean. Would that be the tall stud washer only?Anywhere else?
>>>>>> under the washers of the 4 fasteners in the valve cover area. This reduces wicking around the studs/washers.

Dirko on both sides of the valve cover gaskets. Anywhere else? I suppose this should be done after break-in and final valve adjustment?
>>>>>> Yes, after. It can be used under cylinders if you want.

518 replaces paper gaskets. I assume you recommend not using paper from the gasket kits, just 518. Use it instead of any paper gasket only, anywhere else?
>>>>> Oil pump primarily.

565 on push rod tube O-rings (both ends of the tube?) galley plugs and any threaded fittings, including the oil pressure relief plugs? Would that include ALL thru bolts, all threads?
>>>>>>correct.

In your video, you use the white teflon permatex on washers, which item from your kit can replace that? How about the pick-up tube o-ring. What can go on that instead of the 3H?
>>>> lube the pick up tube o ring only.. No sealant. 
Thanks 
********************************************************************
Recommended Sealants and their uses:

Curil K-2 Case haves and between cylinders/shims and case.

Loctite 565 Push rod tubes, case thru bolts, galley plugs and threaded fittings

Curil T use to seal the 4 lower head washers. The ones inside the head

Loctite 518 can be used instead of a paper gasket where the gasket isn't maintaining a clearance. Oil pump, camshaft plug