Unisync have there place, but I was never real happy with the results. When I was rallying a Volvo I used a kit that I got from the local FAP dealer. The kit consisted of two aluminum tubes and wires. The tubes slipped into the dampers were you filled them with ATF and the wire slipped into the top of the tubes. You backed off your adjustments then lined up the wires so they were even. This gave you a mechanical reference as to how far the dampers were open. As you adjusted the carbs the wires were kept even. Simple, no guessing if the indicator was the same place from one carb to the other. The kit also left your hands free to adjust the carb. I think I still have the kit in one of my tool boxes, if someone is interested. You could probably make set your self.
Larry
