My carb.vacuum pipes were disconnected recently i may have got them mixed up can anyone help?.

1986 90 v8 with a Lucas 35DM8 distributor fitted with vacuum advance and vacuum retard pipes.
There are three vacuum take of points to supply- vacuum advance, vacuum retard and the hot air vent in the air inlet pipe to carb.

Take of points are-
1-from the centre of the manifold.
2-from the top of Stromberg housing, taking its vacuum from before the buttrefly.
3-from underneath the carb housing, taking its vacuum from after the butterfly.
one of the hoses is fitted with a vacuum delay how does this work and how can you test it.
Delay valve.

Has anyone any info on where these pipes are fitted and if i really need a vacuum retard
.
At present i only have vacuum advance when the throttle is opened none at idle.
I have full retard at idle and none when the the throttle is opened this causes the timing to retard to app10 degrees After Top Dead Centre. I think was for emission control when fitted with the detox pipes to the exhaust manifolds. I have removed these detox pipes and blanked off the holes so would it be best to leave the vacuum retard off?.
Any help or info would be most welcome.