I can not see any Cam being made with mild steel. I think I would Edelbrock and see what they tell ya. Do a Google search on the Cam part number and see if it has been a problem or not. I have not rebuilt an engine in many years so I have not followed the quality of any MFG, but I always used Edelbrock cams when I did and never had a problem.
1968 Coupe <53000 miles on her 289 came off the line Jan 21st 1968. I bought it in 1983
2013 Shelby GT500 Born 12/06/2012 number 439 of 530 in DIB and 1 of 9 with Red Stripes over the top and on the seats