You have seen my pics so you know my vote is for an LSX. My motor is a stock internal LS1 with a set of stage II 5.3 heads, 230-230 .598 lift on a 110lsa, 90mm fast intake and tb and it should make 450 rwhp...I will let you know soon. I have seen that post on the 402 that made 550.
If you really want to get trickey wait and get the dry sumped LS7 out of the new Z06.
An LSx engine will probley end up cheaper than a SBC motor with an aftermarket EFI unit. A LSx motor is also quite a bit lighter than a SBC motor and that equals free performance.
We can also talk about milage.. my nearly 400rwhp 2000 SS Camaro got almost 27mpg on the freeway.
__________________
"A ship in port is safe, but that's not what ships are built for."