The plugs are clean. I was thinking the timing is the likely culprit because I don't have a timing light.

Since you still have points you can dead time it.

Since you still have points you can dead time it.

I went out and bought a timing light and set it. Also I pulled the plugs and they're a little dark. It took me about 4 tries to get the float levels right using the clear fuel tube method so I don't know how it could be the float levels.

The car sat for a number of years before the carburetor rebuild. I had the gas tank boiled out and sealed professionally and double checked to make sure that none of the lines were clogged (return line and vent lines). I blew out all the gas lines. New filters, coil, distributor cap, points, coil, spark plugs, wires, etc.

New fuel pump?

You can see looking at the linkage that both butterflys are opening the same?

New fuel pump?

Yes new fuel pump. A bunch of other new parts as well.

Hopefully you watched the DVD that Ztherapy offers. There are two different drop tests for the pistons. Both are important. I would pull both tops and pistons and try swapping pistons, On mine, I found they had a much closer fall rate than before. A little buffing on the slow one and they were identical. Screw the nozzles up til snug, Install the pistons springs and tops. When doing the drop test, listen, they should sound exactly the same. Lower the nozzles 2 1/2 turns,fill the carbs with oil and give it another try. Mark in Portland