You have two different issues here. 1)low compression 2) low vacuum.
A mistimed cam could cause the vacuum.
Try another intake manifold, it may be damaged underneath. I don't rember if the iron 4v has iron plugs in the underbelly?
Low compression is low compression.
Sorry best I can do from NY in the snow. Guess I'm gonna have to catch a flight to HI and drop in?
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