Driveshaft length LT1/T-56 68 Camaro

[GeoffP]

Hi, this is my first post here...I've already searched through the forums for this info with no luck, so I thought I would post to see if anyone can offer some suggestion(s). I have a 68 Camaro that I am installing an LT1 and T-56. The car already has a factory original 12 bolt, but I'm not sure what size u-joint it has. Since I'll be using the factory motor mounts, I thought surely someone here can tell me what length driveshaft they used for a similar project? I have a friend that owns a salvage yard who is going to give me a shaft for free if I can find one in his "driveshaft pile" that will work. Thanks in advance for any help anyone can offer.

GeoffP
68 Camaro (soon to be LT1/T-56)
87 IROC LT1 4/L60E