I used ebay electric fans for my 5.3 swap in my 1994 obs. I trimmed the fan shroud a bit and retained the original V6 4.3 radiator. U can rewire the original uncut LS harness using the lt1swap.com website. On the same site he removed my vats for $75 with about a 7-10 turn around time. I emailed him a few weeks later after I finished the swap cause I had a few bugs and he keeps record of it. He was able to go back and verify what he tuned on the pcm.