I think Sambo that this question can be answered by any of the 6ltrs LS$ ( because Sambo has a 6Ltr) owners who were at the nationals.
What rear end do they have, what gear box, what tyres, and how did they perform of the track.
If they then also commented on the same car as a road car we would all have something real to compare rather than theory.
Who had 6Ltrs of glorious chev/holden power at the Nationals?.