The chevy stuff isn't as cheap as most think it is, there's just more of it. The cheap stuff is junk, no matter the brand. There are $200 roller rocker sets for BB Mopars, but we all know they're garbage.
The good thing about chevy stuff is there are used parts for sale everywhere just b/c so many people run them.
Good heads, intakes, rockers, etc. are expensive whether it's for a 454 or a 440.
Once you get into the big power stuff...all brands are expensive.