Driveshaft advice on my 69 Z

[Lynn]

Right now my 69 Z has a 67 or 68 driveshaft in it.
I suspect a warranty replacement, because of the following:

1. My rear axle is a warranty replacement.
2. Pinion snubber is original and has a small chunk missing. Looks like something hit it.
3. Replaced my gas tank recently and checked the date code on the old one. Jan of 70.

So, I am guessing someone was having some serious fun when this car was new and grenaded the rear bad enought to take out the driveshaft, gas tank and cause damage to the snubber.

But I digress (just like doing detective work, but who really knows?)

My driveshaft needs re-tubed. Because it is a 68, it is a litte too long, but the trunions are the same, so I can use these. There are guys locally who can do this for me. My first question: I know the u-joints were out of phase on the 69 Z. See discussion, along with links to more discussions:

http://www.camaros.org/forum/index.php?topic=4623.0

Anyone know EXACTLY how many degrees out of phase? I have heard 20 degrees, 30 degrees, and everything in between.

Second question. Would I be better off just having it re-tubed with the yokes in phase? I don't believe anyone has ever come up with an explanation for <span style="font-weight: bold">why</span> GM did the 69 Camaro out of phase, and no car since.

Opinions?

Thanks.