I understand the issue of flex at the body/ subframe and tying the front and rear together. But isn't that what we are trying to do?

In other words, with a solid frame, typically, rubber was used from the factory. If the connectors are not welded to the floor pan, should I still stick with solid or poly mounts?

I just want to stiffen up things a bit. Vert with a bit more power than stock.

Dave