A piece of pipe is much easier and more suitable than a carb balancer. You simply listen for the noise difference and adjust accordingly.

I've owned many sets of carbs and tuned lots of them too. I use a length of heater hose.

Be sure to check the volume of fuel the stock Fuel pump is supplying. The PSI rating is important but volume is more important. If it cant keep up with the comsumption, you have no hope of carbs working to their potential. Weber DCOE's like 2.5 - 3PSI. Dellorto's like the same.
This is more critical when sustained high revs. A street car not so much. Also with mechanical type fuel pump that run off the camshaft, as the rotational speed of the camshaft increases the mechanical arm in the fuel pump can start to float and bounce on the lube, similar to valve bounce in the valve train and can start ti not pump fuel as well.
I run an electric pump which helps with consistent even delivery of fuel independent of engine rpm.

When I made the switch to running e85 ethanol fuel this becomes more apparent dew to the increase of fuel required for a correct A/F ratio. ~35% to 45% more fuel is used. Thin walled emulsion tunes and ~170 main jet size to feed a 1527cc A15.

Electric pumps can be had from the early 720 utes, I think some patrols had them also. facet make quite a few and so does nismo.

electric fuel pumps.

Yes, balance those carbs properly by using a piece of hose. Or pay a professional to do it.

The stock A12 fuel pump volume is 500 ml/minute, or enough for a 120HP engine. Test it by timing it at idle for 60 seconds, it should fill a half liter container. It will ouput even more at high RPMs, at least up to 6600 RPM there is no problem.

Benny, dd... I already have a facet electric fuel pump which is certainly adequate, not a standard A12 mechanical one.

Fit a fuel pressure reg and you should on the money. Fit it the following order. Facet pump, carbs ( with a return, so that fuel will flow past them) then the fuel regulator. Any access pressure will be bled off and return to tank. This method ensure a constant even supply of fuel.