I live in the NYC/Metro area & that's the price I was quoted to do the labor, more or less. The dealer that quoted me was below a $100 @ hr on the labor. If I remember right the total job, parts + labor was right at $1400 with the sales tax.
Tom
On the trans issue, I think the early Z's had black tag (made in Germany) and the later Z's were blue tag (made in USA). The gears in 1 thru 4 on the blue tag ones had different cut angle for less whine. I also believe the inputshaft collar has a different diameter so the T/O is different P/N on the blue tag trans but that may not apply to the Z, just the other 6spd C4's.