For the 440s, Edelbrock made them out of aluminum for the 1969 Road Runners & Super Bees.
Chrysler did start making their own out of iron for the 1970 model year, but the left over aluminum intakes were used up on early 1970 model year cars also.
Note item 1. in the 1969 PIB about the 1969 440-6 cars on the page at the link below.
