Square body, body drop info

Finally getting the old dually stripped down and about to start cutting up the frame. Before I start hacking however I was wondering if there is a certain place I should hack the frame to do the Z?? I had just planned on doing it in front of the cab, but as close I can without hitting it or being to close. Just want to make sure there's not a certain place I should cut it.

i cut mine even with my firewall....

That's where I planned on cutting mine also. I just wanted to make sure there wasn't a certain place I should be cutting it before I hack my frame in half.
Also has anyone running a big block radiator had any issues dropping their frame horns?? Looking at mine it looks like it's going to be a close call getting my radiator to fit back in.

mine has a big block radiator....it will fit...what I done on mine was slid it to passenger side enough to get the lower hose on so I wouldn't have to cut the frame horns down for it...worked good for me

Thanks for the info guys. I'll take a look at just sliding it over.