Thanks...I'll see if he'll let me grab 2-3 shafts (most likely he will) I'll just use the one that works and take the rest back.
He said a lot of the newer cars they're getting in have aluminum driveshafts in them, so I'm hoping to find a good one that'll work. I promise I won't come back on here to say "It didn't work" I just needed the ballpark measurement to get me close since he wants me to get the shaft(s) when I pick up the motor and transmission, hopefully Wednesday evening. BTW, I'll be using small block mounts as well.
Thanks again!
Geoff