Just as slow as before mods..

I wanna make this clear one more time. I'm not giving up on this car. I love this car. I'm selling because our small business has tanked last two years with this economy and I'm liquidating assets to pay the rent and survive. I've had to lay off couple workers and do the work myself. Sold two trucks already and the Demon is last on the list. Cars are toys, they don't pay my bills. If I take a huge loss, so be it. Not the first time. Even 2008 wasn't this bad.
Well. I think you'll do better on the sale if you get it running better. Not that I think most of the market value is in the mechanicals, but it helps.

Rotate the electric choke so its further open when cold. Choke is the last thing to adjust on the carb. Get the throttle cable and 'kickdown' cable figured out. Then set the hot idle mixture, initial timing, and idle speed. That's a iterative process. Just get it close to begin with. You can tune it finer later. All that will make a huge difference. When that's all good, then you can fiddle with the choke and choke pull-off adjustment. Until then just give it a couple of extra pumpsas needed from the throttle when starting cold.

Since the car has an electric pump, you can use that to get fuel out of the tank. Be CAREFUL. Static electricity as well as real electiricity can cause a spark. Pump it into 5 gal fuel containers.

Then put the battery on charge before running the car. Using the alternator to recharge a very low battery will lead to other problems.