Need a measurement - 55,6 or7

[57 restomod]

My 57 is stripped down to the frame and front ifs clip is installed. I'm about to set the new 350 and 700r4 in place so I can make motor and tranny mounts. In order to position the motor properly for and aft I need to know where the firewall comes to and my cab is 80 miles from here. I do have the rad support with no rad in it that I can mount in place.
If someone could take a measurement for me from the rad support to the firewall (the indented part where the distributor will sit), I would really appreciate it.

 

[5257]

I just pulled the fenders on my 57 to access the motor easier- the measurement from the inside of the rad support to the indentation of the firewall is 39 inches. Good luck.