ls1 vs ls2
You will need a LS2 adaptor harness - believe TSP sells this.
If you plan to sleeve the LS2 block, you will likely use few of the remaining parts. Rotating assembly, cam and heads will probably be replaced to accomodate a big bore engine, not leaving a lot left. Unless you are getting the LS2 long block for less than $1K might be easier to just sleeve what you have.



