I'm with Mike on this one.
The 6Ltr with cam, springs, etc are getting around 400rwhp...more than enough to get most folks into trouble. It is at this 400hp point that I feel a cobra becomes "less enjoyable".
I would much prefer to spend the difference in costs on suspension/brakes etc.
Mind you...the 6.2 is appealing because of the low cost.....they can be had for about $7000.00 at the moment but may well get cheaper. see here:
http://www.ls1.com.au/forum/showthread.php?t=103566
However, that's still approx double what a L98 would cost in bare crate form.