In reply to the leaking valve covers. Just recently changed intake and camshaft on my old bucket T. I didn't have a bit of problem beforehand. I've built MANY engines and had to learn the "tricks" on sealing of covers to heads and it's been a long time since I even saw any seepage. I installed the valve covers lastly and was surprised to see leakage.The problem was the covers touched the intake and wouldn't let the gasket seal accept much torque at top of the head.
Nothing that a file didn't take off, I cut .050 or.060 off .Factory defect? I don't know. Dry as a bone now. Good luck & God Bless all the readers................