On my '84 Vin A, EFE is electric grid under the carb. The OEM EGR valve works on back pressure of the exhaust system and vacuum from the valve cover mounted solenoid pack (2 solenoids there, one provides some kind of N.O. vacuum vent function and the other appears to be a N.C. vacuum on/off valve). The EGR valve pintle was clogged with carbon thus always vented the vacuum, this took some time to get it cleared. The spare aftermarket EGR valve I have is strictly vacuum operated with an orifice washer to meter exhaust flow.
The air box snorkel has the traditional vacuum butterfly with thermal vacuum switch mounted in the air box and the vacuum supply comes from a vacuum Tee fitting off the carb rear.
The canister purge has no electric parts, it's controlled by a manifold thermal vacuum switch mounted in the intake manifold water passage just in front of the carburetor but offset slightly to the drivers side. The vacuum source comes from a nipple on the front of carb. There's a N.C. vacuum purge valve that's controlled by the manifold thermal vacuum switch which isolates the carb bowl vent from the canister while the vacuum switch is closed (cold motor) and a green N.C thermal disk puck about an inch from the bowl vent nipple (closed when ambient is cold).
So there are four tubes on the vacuum operated canister purge valve, the purge valve,
1) Bowl vent from the carb bowl puck valve
2) purge Tube to canister
3) Manifold Thermal Vacuum switch to canister purge valve diaphragm (vacuum opens pintle to canister purge tube).
4) vacuum purge line connected to carb vacuum port
Most vin A were California seems like and I would guess the remainder of vin A Federal version primarily wore Buick hubcaps?
Not sure what the manual trans Iraqui Taxi's had, they eventually went to Canada, right? Don't see many around, perhaps the 231?
FWIW, In case any of that helps.