Need advise on Sub frame connectors

I've been checking this site out for yrs trying to find ideas. I'm finally starting to get my 72 dodge dart custom back on the road. I'm currently gathering parts to install a 5.7 hemi into it, it's gunna be relatively stock power wise,. Anyway what im getting at is do I need subframe connectors? And has anyone ever done or seen them on a 4 door?

Every early Mopar can benefit greatly from adding subframe connectors.
Personally I used 2x3 square stock because 3 inch fits perfect over the existing rear subframe section.

I could see the benefit of the US Cartool connectors being welded to the floor pan, but for a driver type car I think it’s overkill.