1974 Dodge Dart Magnum Swap

It's been a while since I have posted. Have had the car up and driving over the summer but still have a few kinks to work out. I have a horrible vibration in the drive line some where that got worse when I switched my rear end gear ratio. If I shut my engine off as I'm moving the vibration stops. I'm thinking something in the flex plate weights is off. Either way here are a couple pics.

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Hey how did you eventually get your exhaust headers to fit? Were you able to get a master cylinder and booster in with your valve covers?