Flores is right, generally you can swap over your wiring and accessories from your existing engine, although various year blocks, and even various models (TJ, ZJ, etc.) differ and can make using your accessories difficult. For example, when I swapped a 99 TJ block into my 99XJ, I had to use a TJ power steering pump bracket, as the bosses on the block wouldn't accept the XJ version... IIRC post-96 blocks have some extra webbing that supposedly offer some additional strength, but it didn't stop me from blowing them up anyways... you want to use a 0630 head, doesn't matter if its late model or not, you can just plug the temp sensor in the back for newer applications. :cheers: