I love 122.s very robust cars, ones with drums on the front seem rare, most were discs. maybe around 62 they had drums. there are two seat styles, the later isn ore like a VW bug earlier are likely leather and not the corrugated vinyl stuff. window winders changed style. the trunk emblem was larger and sported the "male symbol on earlier 122's.
that car in the pic has later year hubcaps.
I think the v-o-l-v-o emblems on the hood changed from gold to silver in about 66 or so. earleir ones were gold colored. most parts within the series are interchangable
electrical system was good, very simple maybe 3-4 fuses its not made by the prince of darkness ;-) most had generators you can convert easy.
very liittle issues with degrading plastic, most plastic is actually bakalite which lasts over time. the vibyl seats don't seem to decompose, a lot of 80's cars are suffering from plastic rot now.
I have two of them, one has a 3 speed auto the other I put a 4 speed with overdrive , thats the one to have..
heads and cam from about a 74 140 will make it faster, bigger valves. I doid lots ot mine it puts out tons of power, B18 bored to B20 solid cast iron blocks and heads. push rods, early ones may be B16 with a single carb most had dual SU's which are what I like.
look for rust below drivers feet under the car, quarter panels, it is unibody so watch out.
bottom of front fenders catch ud, inner fenders , rear wheel lips.
suspension componets look at the rear axle there will be two rods, before about 67 they were a stamped out tin bracket thing they rust, later ones were round rod, there was a bit of a body mount change to incorperate that.
you cna drive it like you hate it ( I do) cheaper than therapy they say ;-)
heres a fun video.