Need driveshaft dimenisions for 351C/C-6

Hi! New Member needs help!!!

I can't find a driveshaft for my 70 Mach1. Ford used to produce something for the dealer partsmen to research driveline dimensions. I saw one of the books about 15 years ago but the young guys don't have access to that kind of data/info any longer. If I had the dimensions I could have one of the local vendors build one for me. I have the engine/trans ready to install back into the car.

Thanks for any response.