Photos Sub Frame Connectors
I used US Car Tool frame connector. They are lazer cut to match the profile of the floor, looks like a full framed car when you are done. They are machined 12 gauge steel and cheap in my opinion $169.
https://store.uscartool.com/67-75-Mopar-A-Body-Frame-Connectors_p_16.html
Here are some pics of them being installed on my 68 Dart.
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