Any tips on fitting the US Car Tool Sub Frame connectors?

There is a video on YouTube that shows the installation process. The video is called "How To Install Mopar Subframe Connectors" by Popular Hotrodding. They are installing Reilly Motor Sports SFCs, but it appears that they are close in appearance to USCT. Pretty much step by step. Regarding the welding, they show the bead starting on the SFCs, and working the bead and heat into the floor metal. There are other videos there as well. Just a thought on what I found while installing mine. Hope it is helpful. Old Dart 66, Jerry