Pretty nasty ring gaps, although I cannot swear that they e the sole cause for the low compression. Whats the compression height of the pistons??
It’s nice to find exciting things like no gasket on an intake manifold as it gives reason to believe you’ve ‘found something.’ Copper port gaskets are the slickest, try restoration supply company or Olsen’s gaskets. You can use heavy gasket paper – 1/32″. The 1/8″ pipe plugs are likely for primer cups. I have seen primer cups installed in the intake port, with these plugs in the jug as well. The jugs had plugs right up through Series 9-A. Do you have primer cups on yours? With a memory like mine, I’m lucky I can recall my old ’13 at all. I remember best the wind, the effortless shifting, effortless steering, the suspension that galloped over bumps (the shorter wheelbase was really kind of fun) and the wonderful rock-solid confidence I felt when driving a steady 50+ in the car. It really had a fantastic feel to it. Sometimes, late at night on a quiet road, I would stand right up with one hand on the windshield and my right hand on the steering wheel. It was quite comfortable, felt like
