CONGRATULATIONS, I am the new owner of Patricks old 122 and yes the floor is great. As for the break and clutch fluid DO NOT USE DOT 5 ! In the past I used dot 5 in a car specifying dot 4, it worked well for a while but after 16 months of use all the rubber turned to mush(not over-night but a slow decline)leading to leaks and poor performance. I would suggest dot 4 for the breaks and clutch(though not required in the clutch, but saves the need to buy 2 types). Since you don't know the maintenance of the P.O. it would be advisable to flush out all the old break and clutch fluid, a good maintenance proceedure every 2 years. As for winterizing I would like to add a check and lube of the breaks and wheel bearings, check that the heater hoses are in good shape and before adding new coolent do a flush. When the new coolent is added also add a stop leak/pump lubricant to the system as a saftey pre-caution. And the best advice I can give you to kepp it for a long time(as we are want to do with a 122) is to by a beater 240 or 740 for the winter, they are available , cheap, safe, warm, and parts are more readily available. If you are close to the Quebec border I can sell you old faith-full for a reasonable cost($400.00 cdn). Its a nice 81 242 that starts on command even in the coldest of cold spells, and I have no more use for the car, but want it to go to a good volvo home.
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65 122, 73 P1800ES, 79 242GT, 80 262C, 81 242, 87 780,88 745T X2, and a plethora of parts cars and eventually to be finished projects