That dyno sheet looks like the cam is way smaller than 280/290. Are the heads MW port size? I'm assuming they are since you are using an Indy intake but something moved the power peaks down lower than expected. Did you physically verify that the camshaft was the one that you ordered? The dyno sheet looks like the cam is maybe 20 degrees smaller than what you posted.

And what is going on with the oil pressure? That isn't a good situation with the pressure climbing as the RPM goes up. The pressure relief valve might be stuck or blocked. You should set the relief spring so the max pressure is around 70 psi.