My HF compression tester had one dodgy bit but was otherwise OK. The 90 deg elbow broke, just won't take any stress at all. It was replaced with a 1/4"(I think, not certain, posted a thread about it) JIC elbow which has been perfect. Was about ten bucks at a local auto parts store.

You say the valves were adjusted, how long ago/how many miles ago was that, and how long had it been before then? If they haven't been done in awhile, you'll find they go tight again FAST(under 5k miles) as carbon on the seats wears off. Might be worth checking the valves again - at least that's where I'd start.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap