no sensors unless you have a feedback carb, and they wouldnt plug into the block. Maybe from removed brackets if they took A/C or power steering out.
the 2 metal pipes are for the ASV system, not the egr system. it pumps air into the exhaust to aid the catalyst. look just behind the heads of the car for the asv valves (maybe 1 valve in EA81, not sure). it will be squareish with 2 ports, one threaded and 1 meant for a rubber hose. if they bothered to weld the tubes Im sure they pulled them but if not then all you have to do is get a new tube from the JY. debatable whether it will make your readings go up on an emission test but it could. cant help on the inspection thing, we dont have that here. if they are specific about what systems are on it then maybe you can skate.
im guessing that the holes your talking about are next to the carb? there are a few mounting points for vacuum switches and such. im guessing they removed some of the valves that run the carb but I would have to see it to know. does it have a weber? stock it will have a peanut shaped air box with a couple hundred hoses running everywhich way. if its been webered or the the carb has been gutted then it will be missing a lot of the hoses and maybe the airbox as well.
the EGR is a round valve on the back of your intake manifold. it will be supplied with manifold vacuum to operate the valve, and as long as the metal pipe from the head runs to the manifold and the valve is working then all the EGR system is there. cant say whether it works or not though. if you see a plate with 2 bolts in the back of your manifold then the egr has been removed.
does your engine look like the one in this thread?
or does it look like the one in this one?
really need some pics