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@gbj_tester
The crank doesn't need changing. The dérailleur selection depends on whether you want pretty or functional. Shimano RD-1050 and SL-1050 or 600 or DuraAce of similar vintage would be best functionally, but if you don't care about nice shifting take your pick from Campag, Huret, Simplex, Suntour or whatever. There is also Shimano Deore from the olden days, with thumb shift and the possibility of using a wider range freewheel, but finding good ones at reasonable prices might be harder as vintage MTB has more of a collectors' market than mid/low end road gear.