Yah, the guy who trailored them in (presumably the owner/builder) was telling me the sizes of the engines and they were both <1600 cc if I remember correctly...and N/A.
They were definately the slowest cars out there.
BTW, the Black 280Z had one of the meanest sounding V8's I've ever heard in it. Looked like the lady driving it was having a blast too.
