Subframe connectors for a driver/cruiser, necessary to weld to floor?

I would definitely be on the fence about installing them in your car. My old '67 hardtop (440/4sp/3.23SG/no traction) felt just fine without connectors. With the factory big block suspension handling was decent. When all of those parts were transferred to my son's '67 convertible we installed connectors. The convertible definitely needed them. I also have connectors in my Barracuda convertible (440/727), but will not be installing them in the GTS convertible to keep it more original. In a convertible you can feel the difference, a hardtop not as much.