No top end power, need help

Ohhhh. It should be that close eh? I rechecked the rotor phasing and it is not even close to the corner. At around 1/3 throttle or so it is close to dead center (with vacuum advance hooked up). At idle its well past the cap contact point, somewhere around a full contact points worth clockwise.

Tell me again? Is your ignition "all in the distributor?" Or does the distributor trigger an external box?

What specific distributor is this?