Eric,
I looked at those cars too (i live in Oshkosh). Looks like he had a ton of parts laying around and in the cars. Did the 280z sell as well (the one under the tarp)? I have a 280z that i've been working on for about 8 months now, its been slow going be very fun / learning alot.
PS I see that your an engineer, where do you work? I work at Oshkosh Truck
Good luck on your project(s)
-Colin