Drive shaft ?'s

[sameyrasmea72]

I am very close to having my “ rolling chassis “ complete, about all I need is the drive shaft. My truck is a 72 SWB BB/400 and the drive shaft I plan on using is a two piece out of a 72 LWB, BB truck. My questions are:

1. Did all these trucks in 72 have a 2-piece drive shaft?
2. I assume from what I can tell, that a big block has a thicker Drive shaft and a different carrier bearing / bracket than a SB. The bracket and bearing that I have is off a big block but the bracket when put up to the cross member on the frame lines up with two different sets of pre-drilled holes. Does anybody know which set of holes to bolt the bracket up to, and might the difference be between a SWB and a LWB to get a better angle?
3. I need to shorten at least one of the shafts. This is probably a stupid question but it looks like the rear shaft can be left at the original length even though it was from a LWB ? What is the best way to measure the length of the front shaft in order to get it to the correct length.? Or better yet does anybody have the correct measurement? It looks like it is going to be a relatively short shaft, but I guess that is normal for a SWB.

Thanks in advance……….Jason