273 Mystery Motor

brodphish said

Junkyard the motor was running good, I took it in for PM. The same shop had my 67 earlier and went through it, got it back in a week and it was a much better car for it. They addressed a number of niggly issues. So I thought I'd have them at least look at the valve adjustments on my 65.

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Yep you have something wrong going on there. Solid cams and adjustable rockers were factory on the 2 and 4 barrel engines from 64 through 67. The cams between the 2 were a bit different. In 68 and 9 they went to a hydraulic cam and non adjustable rockers. The pushrods were also different on the hydraulic engines. You can use the adjustable rockers with a hydraulic cam as long as you use a special pushrod. Who knows what combination you have going on in there.