Oh, fun! I'll try 1982. I'm creating these teams with the assumption that many of the questionable 1966-68 birthdates would have been subject to further manipulation.
USSR: Yurchenko, Bicherova, Mostepanova, Ilienko, Shishova, Shkoda
ROM: Szabo, Agache, Stanulet, Dunca, one or both Renciu twins...?! Zelenca?? Barbalata? An underaged Cutina? Poor Eberle? Their team was kind of a mystery that year. Cristina Grigoras missed the World Cup with an injury, so I'm guessing she wouldn't have been available for Worlds.
China: Ma Yanhong, Chen Yongyan, Wu Jiani, Yang Yanli, Yu Xiang, Wen Jia (this is based on their Asian Games team).
USA: McNamara, Goodwin, Roethlisberger, Collins, Service, maybe Talavera? She missed the World Cup with an injury but competed at the Chunichi Cup several weeks later. Kathy Johnson was out of action with a broken foot
Bulgaria would have sent an underaged Stoyanova, no question. Plus Grantcharova, Marinova, Topalova, Demireva, and an underaged Dudeva.
GDR: Gnauck, Gnauck, Gnauck, Gnauck, Gnauck, and Gnauck. She was their sole representative at the World Cup, so I have no idea if any of her teammates were fit to compete. Maybe Rensch and Voigt?
OK, possible results:
Team:
1 .) USSR
2.) China
3.) Romania
AA:
1t.) Yurchenko and Bicherova. They were evenly matched at the World Cup, and I can't see a different result at Worlds.
3t) Szabo and Agache, because I can't and won't chose.
V:
1.) Yurchenko
2.) Bicherova
3.) Agache
UB:
1.) Ma Yanhong
2.) McNamara
3.) Yurchenko
Fuck Gnauck.
BB:
1.) Yurchenko
2.) Ilienko (she was 2-per'ed at the World Cup, so this is retroactive justice)
3.) A Chinese gymnast other than Wu Jiani. I can't unknow!
FX:
1.) Bicherova
2.) Szabo
3 ) Yurchenko