by nova
Looking at the JvC Nunchuck Torso I've got here...it does use a Ball Jointed head...
Most if not all of the JvC style figures did have Round Neck balls. (Wild Bill, Nunchuck, Dusty, T Crotch Wetsuit, T Crotch Heavy duty, all the other T Crotch figures.
It was the Spy Troops figures who started the Flat bottomed neck balls...(Cross Hairs, Scalple, Recondo.
Construction is really so inconsistant you pretty much have to check the parts to be sure.
Johnny Cange's (Sagat legs, Road Pig Torso, BC Muskrat arms) head will fit...but will require some work...the neck ball is a bit too large and the neck is a tad long from being made to fit the Roadpig body.