I'm certain there are those who have used stainless as I almost did. Probably just one of many reasons we hear of header problems. Despite our our good intentions, factory engineering is usually the way to go.

1962 Fleetside 4spd 235 w/O.D. posi 3:90
In the Stovebolt Gallery
1990 Subaru Legacy Wagon AWD 2.2 5sp
2013 Ram Tradesman C/V
My Webshot Photos]