67 Cuda: disappointing dyno numbers, need some advice!

The stamped rocker ratio is right at 1.5 based on my direct measurements of the rockers alone, up to .500" lift at least, and even with the pushrod angle effects thrown in, the overall ratio is not that much below 1.5. The roller rockers per se are not going to buy you any lift.... they do nothing to change the pushrod angle effects on lift. So unless you just want the roller rockers, you'll be spending money for no effect on the present issue unless you go to 1.6 ratio ones. Plus rollers get into other issues that you are not addressing by just swapping them on, and those issues get worse with higher lift. Working on the rockers later is easy, so I would recommend setting that aside for now.

I'd do the cam alone first, but agree with others that there are other and probably better cam choices out there. I do realize that each time on the dyno costs money. But if you have some place to do your own butt dyno test with each change, you can judge each change on your own, and then go back to the dyno when you are happy with the changes.

BTW with the compression tests, prop the throttle open, pull all plugs for best cranking speed, and cycle each cylinder under test 5 or 6 times.

Valve springs are certainly non-stock but who knows what they are exactly. If someone could measure the force on one at stock installed height and some lift like .400" then the spring rate could be computed and you would have an idea what they really are. Would be a good thing to do when a head is off, if you get to that point.