Recently got my hands on a good 200r4. Was thinking about bolting it in with the 400 in my 69. Read a ton of posts here and have most of the parts lined up. Only things I'm not sure of are the flex plate. (Which one should I use)? I'm guessing not the one with the 350... I was going with the T400 cross member. What tranny mount should I use? Also, has anyone used a wiring kit for the lockup converter? Is it needed if your using the TV cable? All comments are welcomed and appreciated.