n/a 5ltrs sound unreal, went to a wedding yesterday and my mate picked me up in his VS HSV GRANGE, sounded awesome, its dead stock but that 308/304 sound compared to my gen3 was a real v8 sound with the nice lumpy v8 burbal they have,
but i'm a big fan of a nice cam and s/c on top that sounds even better with the lumpy v8 burbal on idle and the s/c wine as you boot off into the distance
best thing with the 304/308 engines is that you can get the vortech style side mount blower or the top mount, so lots of options on the market and the top mount is still easy to work around doesn't take up room as its you intake manifold too. and from what iv been told the bottom end holds up well on the 304/308 motors with a s/c, but can always upgrade it with a nice 355 stroker.
good luck with your choice.