My usual process is to lightly oil the bores with 30wt. wiping away the excess so the bores are damp. Then oil the wrist pins and the piston skirts with 30wt. coat the bearings with assembly lube and slide them puppies in. The rings seat quickly, and the plugs don't foul. I've used this same process for years and I haven't had a problem yet.
BSE Racing Engines