I think the power curve sucks. Notice the wave action on hp and torque? That should be smooth, not spikey. Does the timing mark stay steady as the rpms rise or does it move around (will need a dial back light for that)? I think there's more power in it. It should not be surging like that. Things to look at: The air/fuel gets fat as the rpms rise. You're either rich on primaries or secondaries. As the air door opens against the spring there should not be a rich condition. It should be a tad lean during that. Also check your distributor and things like oil pump drive and bushing, the timing set... Those curves should not be wavey. You didn't get hosed on the deal in terms of the engine. Looks like the actual engine cost was closer to $4K without the carb or stuff to bolt it in. Which is for me a mild performance type build figure. It may have re-used parts that should not have been.. like the OP drive. That will cause a fluctuation in the output. Somethings definately "off".