LS2 brackets on LS1
Or would it just be a matter of swapping the crank pulley to an LS2 pulley on the LS1 crank.
I do know that I switched from the GTO drive setup on my LS2 to the corvette drive system and was required to switch crank balancer/pulley, I am also switching water pumps as well because I like the look of the vette waterpump.
Just make sure you get the whole drive system, brackets, balancer/crank pulley and of course bolts if you can. Those start to add up.

