Swapping from iron to aluminum heads

The articles are Chevy because you can get virtually identical Chevy heads in both. With a Mopar you can't. Even the machined full chamber can be taken advantage of more than an open chamber as-cast iron head.
So what does aluminum do for us then? It allows a Mopar builder to incorporate certain details into the build that will produce more power when exploited, and they give an instant relevant weight reduction. If you just bolt them OOTB they may give you a little more power, but the feel and performance improvement will be from the weight reduction. If you have a professional performance shop check an correct them they will give you more of a gain as a really good valve job translates into more cfm and more power - but again I think in general the gain felt will be more from weight reduction than actual mammoth increses in power unless your iron heads were really that worn or screwed up. If you use them and plan to rebuild the shortblock too then they can make a good improvement without porting but with correcting. Even more so with porting. I'll still prefer an aluminum head to an iron for any build not restricted by class rules.