I used to repair zcars in northern california and have several good units particularly for 1975 & 1976 Z's. I've sold used units for $200 and the way thing are i'll take $125 shipped.
I have a very low mile turbo unit in California asking $450 and that was the price back in the early 90's. Today these parts are hard to find and will cost a pretty penny...,.tel # 510-878-0028.
Mor than likely you're hearing a bad throw-0ut bearing coupled wit a worn output-shaft main bearing. However I have a dog leg 5/speed with original 20,000 mls. and want $675 for it.
I have a professionally built n-42 head sitting on the shelf. Comes with cam-shaft for $650 + shipping and handling as I'm in northern california San fran. bay area. Without the cam $575 + s&h. You may call me @ 510-878-0028.
Hey guy i have a set of 15x7 alloys like new and very rare design with the right offset for your Z. I'm not sure how cheap you're talking but these can bring a pretty dollar...asking $300 and they have tires 510-878-0028.