Frame/body help

[burbygurby]

I know these time period mustang didn’t have a separate frame which is why I’m asking if I need to add some sort of support to my mustang (73 mach 1) because I am taking the original 351c and upgrading it to about 400 horsepower

 

[turtle5353]

Subframe connectors wouldn’t hurt. I like mine.

 

[Steve McMahan]

Get the weld in kind

 

[Hemikiller]

Global West makes a form fitting tubular subframe connector that's weld-in.

https://www.globalwest.net/mustang-1971-1972-1973-subframes-supports-global-west-suspension.html