Many dealers take the stock LS6 castings and rework the intake, bowl area and exhaust ports with either a custom
hand grinding or a cnc porting of the heads, they can make very good numbers.
I was looking at the Trickflow cnc machined units but the price at that time was more then I wanted to spend
but the "As Cast" where just coming out on the market and where a fraction of the price and where only 10hp less
then the cnc'd units so that is the direction that I went.
Before that I was looking at the LS6 casting with the water chilled marks, 5-10hp more over the normal
or a set of Patriot Performance or Texas Speed ported LS6 units, there is lots of info out there for Paul to read
when and if he is ready to do the next round of mods.