Welcome to the board Pete. Hey, post some pics of your ride, it sounds great.
As far as not pulling too well, a few things you have probably already thought about:
-What gas are you running? The 10.75 flat tops need good octane.
-What shape are the rings and valves in? You may want to do a compression test. That setup (depending on the cam) should run in the 190 - 220 psi cranking compression which is too high for most premium gas. Octane booster helps.
-Assuming everything else is OK and you have good enough fuel, 400's like a lot of ignition lead. 36 - 40 degrees should wake it up with an advance curve in by 2800. Also, your carb may need some adjusting. Pontiacs tend to be "fuelish"...
Good luck with your project.
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