Time to make the cut

[LayFrame72]

..I have been searching the forum for more than an hour with no luck and my eyes are burning from staring at the screen without blinking...What im looking for is a measurement to use on where to cut for my Z..Ive seen alot of pictures, It looks to be between the shock mount and the front cab mount..But im looking for a number I guess..Saw a frame spec pic somewhere and it looked to be somewhere in the 47.25 range (thats from the front frame horn to where the actual cut would be)..Im down to bare frame so the "Cut at the firewall" expession dosnt help me much. So if someone could give me a measurement I would be thankful. Also, I remember reading almost a year ago somewhere on here (of course I forgot the members name) but there was discussion thead of how to angle your Z cut to center the front wheels..If ANYONE knows that please let me know.