Fan clutch for 70 Duster 340

[340dustr]

Does anyone know what style of fan clutch came stock on a 70 Duster 340 no a/c?
Was it thermal or torque drive(non-thermal)?
I suspect it was a non-thermal style but want to know if this is true before trying to locate one.

 

[ir3333]

not thermal,just viscous i believe.

 

[Sedanman]

My 67 Valiant with v8 and a/c had a thermal