Is this stuff normal?

drive it till its nice and hot a good hour long drive

check again.....

You live in a very cold place..... if the engine never gets hot enough to boil off condensation that collects on the inside of the block you get this. park it up and I bet its practically raining inside the block on a damp winters day.

whilst it is usually a head gasket problem that causes it, it isn't necessarily always the case

you do see it on VW bug engines as well, which of course are air cooled.

coolant into oil doesn't necessarily mean any gasket seal problems around a combustion chamber so you may not see a varnished plug or white smoke out the tail pipe.....
how are the rockers fed on a slant? up the pushrods or via a dedicated feed?

if its a pressurized feed from block to head up a pedestal and into the rocker shaft that would be my guess, a gasket breach between the oil feed and a coolant or casting sand removal hole in the head and gasket.

did you check the dowel height when you bolted on the head?

check to see if your oil level is increasing i.e do you have a split in the diaphragm of the fuel pump, letting ethanol infused hygroscopic petrol leak into the sump.... does the oil stink of fuel

Dave