Welcome from Virginia. As others said buy the most complete car you can. Take your time when working on it and do it safely. Download or purchase a service manual. When you need help ask the community. We have all been there before. Post pic t uses of before during and after. We all like eye candy.
That swap made a lot of work for you. They aren't hard to change but then you say "I'm going to fix this while I have it out" and then you see all the other things....
Tried Advance Auto or Richard Eberg on eBay? I got my cable from Rick and a couple of other things I couldn't find. Emailed him about a 3 pring reverse light switch and he dug one up.
Link to his store.
https://ebay.us/m/E8ZYup
Leave it stealth. Make them guess it's what I do. Mine says 340+6 but I make them guess what that means. Big block buddies of mine hate me because of it.
High volume oil pump and 50W oil is what I run in my 416. Don't use a Fram filter. Get a quality one built for higher pressures like a Moroso. My pump sucked my Fram filter inside itself. Won't use another one.