67 Cuda: disappointing dyno numbers, need some advice!

Brandt Fonda said
Sounds right, I think I will put the rockers on tho shouldn't hurt and might help a little?

Changing the rockers won't do anything you're going to notice.

Honestly I'd leave it alone until I had time to pull the heads and really see what was in there. Or until I could afford to replace the heads, if they're 308's then they're open chamber and you can boost the compression with a set of closed chamber heads.

PRH said
Probably in the 8.5-9.0 CR range.

Just run it til the season is over.
Here’s my thoughts on what is likely in the motor...... based on the mid-90’s build timeline.....

“Trw flat tops”, Trw used to have those. Stock replacement forged piston for like a 71 360. Flat, no valve pockets, down the hole about .090”.
I used them in a 360 for my father in 1990.
That build was 8.8:1.

“455 MP cam”, From what I’ve been told, Mopar used to have a .455/.455, 272/272-112 cam for the small blocks.
It disappeared from the line up somewhere in the late 90’s, early 00’s....... but was available for the BB for a while longer.
I bet that’s whats in there.

Sounds about right to me.

Some of it will depend on the machine work done on the engine and heads, maybe the OP will get lucky and the pistons aren't that far down and the primary culprit for the low compression is large head chambers.

Either way, the results of the dyno make perfect sense with that kind of compression. There might be a little more power there with a better matched cam and some tuning. But if a bunch more horsepower is desired, it's going to take some work. If it's got open chamber 308's on it maybe the head chambers are large and the fix can be just a set of closed chamber aluminum heads. Of course if it doesn't have open chamber heads on it and the pistons are way down in the cylinders it might take a full tear down to really address that compression.