Not to z the frame or to z the frame

[boomer]

2 questions? in regard to 87 bagged gmc

A. can one run 2by3 box tubing from control arms back to end of cab and lower cab mounts 4" and rad support the same and be done with. No z necessary.
This is only a question being asked because im sure i seen someone on the net saying on there 85 they stockfloored it like this? It was a 85 white chevy shortbox that was on www.mautofied.com for some time and it made its way around the internet in differnet pics. It was from tennesse.

If not that way, for me to run 2by4under cab and z it like 3 inches up front while running a 15"tire and rim that should be adequate enuff for me to be able to shave the pinch off and lay rocker. If the truck doesnt lay body from front to back im not gonna bother doing it.

As for the back a 6 or 7 " step notch should lay the box out ???????????

Thanks for any replies