I wanted more cubes, but not going too big, you can get 413ci LS1 blocks, but they tend to be iron as bored out quite a lot.
If i do go for it, it will be a new LS1 block, with forged internals, the right pistons for FI. and cam for it too. but its probably all a dream. I was once offered a Whipple supercharger but saw it being too much hassle to fit back in 2004, as it wasn't specifically made for the LS1. The one in this article does look nice too, that particular one will rise too high to get under the windshield.