will i be able to swap a ls2 for my lt1 and how hard is it to swap a t56 for my 4l60e

 

yes

not that hard

 

will i need to change motor mounts and get a new ecu and is there anything else i will need to the motor swap?

 

search over on ls1tech... you will get a detailed list over there... off the top of my head

you are going to have to replace parts of your body harness, run new fuel lines or use a corvette external fuel pressure regulator because the ls1's just have a feed line while the lt1's use a two line system, you will have to move your tranny mount back about 2 inches, swap out front k members, steering rack, pcm, reflash your new pcm to correct for the tach, new pedals, center console, master cylinder, new tranny cross member,

and of course an ls2 and an ls2 t-56 and a clutch and flywheel

i'm sure i'm forgetting a few small things but that's about the jist of it

why an ls2? you can get an ls1 or lq4 drop out pretty cheap nowadays