95 Yukon swap 6.0

Hello everyone! I’m new to the site and I’m looking for some information on my 1995 GMC Yukon engine swap. I’m putting a L96 6.0 liter with aluminum heads from a newer 2006 yukon Denali. So basically I’m going for reliability and dependability above all, but I’m looking for 400 horsepower. And I need a complete wiring harness. The most important question I have however, is this: what conversion kit do I need and where can I get it? Also I’m hooking this up to a 4L60E.