EGR System removal on a 1972 240z

As mentioned before when i bought my car my EGR system looked like this:

Attachment 74879

some of its components were not working and consequently i decide to remove the following parts from my engine:

- Servo diaphgram

-Assembly AB Valve

My mechanic tested the vacuum for the control valve and it is not working also, so he decided to block all the remaining parts and has left it the following way:

Attachment 74880

I have several queries regarding this modification:

1) Is the deletion of the system done correctly? Could i be having some vacuum leak as some of the blocking is not done as it should?

2) Any additional parts i need to buy in order to install an AC system to this car?