Are All Factory 340 Water Pumps Aluminum?

[Dibbons]

I think a hodgepodge 340 I purchased a few years ago had a cast iron water pump, so I thought I would ask if factory only installed aluminum (1968-1973)? Thank you.

 

[Dutchrebuild]

68-69 340 had a cast iron water pump with outlet on driver's side...70 and up were aluminum with outlet on passenger side

 

[Fm3 Dart]

There were no aluminum water pumps on small blocks until 1970