The /4 and /6 are totally different animals to assemble.
A /6 has way more sealants, many in close proximity to the bearings, it would be a total PITA to assemble with dripping oil.
Main, rod and cam bearings on /4 (T1 and T4) I use oil mixed with little STP blue.
On a /6 I use Clevette 77 bearing guard.
Both /4 and /6 cams I use a quality moly cam lube, in the past I used straight STP blue. On the faces only,
never on bearings or lifter bores.
Rings and cylinders I've done both dry and using oil, I don't really see the difference. Now I assemble dry and shoot 2-3 good squirts of oil down the plug holes once I put on the heads. Once the rockers are all done I hose the springs and rockers with my oil/STP mix before the covers go on.
I always put a hair of axle grease (swepco 101) on main seal lips.
All the engines I've built I never prime them, the exception being engines with aftermarket deep sumps with full flow oil systems.
What I do is use is a bit of swepco on the pump gears, this gives more than adequate suction to prime the pump.
BTW I would never use STP as an oil treatment, but the blue bottle is great stuff for making oil a little sticky for assembly lube and for my lathe.
About a blob in an oilcan does the trick.