Photos Sub Frame Connectors

I think the weld in style are what I need. It will be a fairly stout 440 so with the added weight and HP/TQ I do believe thats the way to go. What wall thickness are yall using? I noticed that Bob your the only one tying yours to the floor pan as well I think thats a must for me. When putting these in how do you guys have the car sitting? On the wheels or jack stands????