How much are HIFs worth?

[MGB <MGB@shoyer.com>]

I decided not to install a pair of HIF carbs on my 80 MGB and stick with the
Weber DGV that's already there (it works, and I'd rather spend the
money/effort on the suspension).  Any idea how much they are worth?  They're
from a 73 or 74, and I've got air cleaners but no intake manifold or
linkages.  I bought them on Ebay and cleaned them up a bit.  I'm trying to
figure out if I'll get my money back, or at least enough to replace the rear
springs and associated bits.

Thanks.

--Steve Shoyer
  1980 MGB