Derek, I don't do eBay, but if you get your hands on those kits, I'd gratefully buy a couple from you! Just let me know when and how!
I had a new 240 in '73 but got rid of it when I first got married in '75.
Later, in '83, I picked up a used one in great shape (not too common here in Canada), and slowly migrated it from stock to hot street/track condition. Unfortunately, the front subframe finally let go from fatigue, and I sold it for parts to a friend in about '97. The Z was one of those great cars that ANYone could work on and tune/modify to whatever level you wanted. And they are an absolute blast to drive! My (second) wife is actually keeping her eyes out for another one - she loved driving it as much as I did.
Hope you get yours back together soon!