Need someone to educate me on 5.7's

ive had literally hundreds of Mopar's over the last 40 years and have built numerous motors but I've never fooled with a 5.7. I have one laying in my garage out of a Chrysler 300 that I bought as a core and I'm trying to figure out if I want to build it or just let it go. I was wondering about the 392 kits that Indy sells, do they fit in a regular 5.7 block or does it take something different? Also what would be the best thing to do if rebuilding it as a performance motor? Pistons? Cam? What's a good basic build? Also, does an automatic off of a 4.7 interchange with the 5.7?