AUSTIN A30. 1955. Classic car. 

Yes. These had Zenith carbs originally. To fit the SU you also have to replace the manifold and the choke cable.

if you take the rotating switch off there is a set of gates. Find out the common wire that gives power to them all. Then move the switch to the left position and see what gates are joined. Then you can work out what wire goes where. Also a volt meter to test what wire is what helps so you lnow what wire is connected to the indicator. PLUS .. A30 s had trafficators not indicators. I took mine off and replaced with trafficators.

A30 was made from 1951 to 1956. Also if you look at the rear window the A30 has a flat smaller window and the A35 has a larger curved sided window.. Its definately an A30.

I think the a35 also had remote gear change.

The A30 also had a chrome front grill and flashing indicators.

I think the a30 has illuminated trafficators. Not indicators.