In order not to repeat previously posted info, may I suggest a couple of threads for your reading pleasure.

LS1 swap part numbers , or 1BADC10's swap journey

Once you read these threads you'll have a clearer picture of what's potentially involved. These threads will also trigger a lot of specific questions on your part and you will get numerous helpful replies to those specific areas of inquiry. There are quite a few of us who have been down the road you are just starting..... So jump in, the water's fine!