Here's what newer sbc heads are trending towards
R07 chamber image by performancecnc on Photobucket
that basic squished figure 8 is being used in a lot of aftermarket race heads, it works pretty well, BUT it creates a very high compression ratio with most shelf stock pistons.
pentroof 4 valve heads are also becoming fairly normal on OEM stuff.
true "hemi" haeds haven't existed fora LONG time, but there are many manufacturers who run "semi-hemi" shapes.