Tiny, I don't think there was any question about coating the threads with something, and perhaps I mis-read Tom's post, but I thought he said he had put teflon tape around the tubing itself??? Which is why I suggested that that was possibly where the problem lie.
Tom, I seriously wasn't exagerating when I claimed 15 minutes (approx). That was with the engine in the truck, (less manifolds).
I'm not sure why you have to take the head off and remove the rocker assembly.
I removed the side cover, the valve cover, and the old tubing. Then I put the new tubing in place, tightened the soldered fitting on the passenger side, put the fittings in place and tightened the driver's side (the outer larger fitting into the block first, then the smaller fitting to seal the fittings to the tubing).
I then bent and connected the tubing to the oil distributor.
After that was done, I bent the tubing to fit under the side cover, ran it up through the head and connected it to the the rocker assembly. Lastly, ran the engine, checked for leaks, and put the covers back in place.
It might be a bit of a stretch, but the directions I received from a fellow over at the VCCA website were pretty explicit about making sure the tightening was done in that order and prior to doing any of the bending.
If you happened to have tightened the lower fitting before the top, you might have "tweaked" the tubing, thus generating the leak. Same type of experience if you tightened the lower fittings in the wrong order.
I hope that you are able to easily fix the leaking problem. However, contrary to the opinion of some of the others here, I would strongly suggest avoiding the JB Weld and other type sealers that have been suggested.
The fittings in the kits (if correct) should work together, properly, with no leaks.