it would cost a bit atleast 10k if you did all the labour yourself
4500 engine
$500-1500 loom and ecu mods off a ls1 (really not sure about exactly what you would use)
$2500 t56
$750 clutch
$100 engine mounts
$250-600 tail shaft
thats kinda ruff costs on what i have seen prices on things.
im not shore were bouts u live but im from western autralia and when i was looking around for things to do to my vx ss i came across a place called performance unlimited and they said they could do a l98 conversion with 590 hp at the crank for 7.5k