Dave,
Sorry for the late reply. I should have been watching this post.
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I don't know what you were looking to spend, but this guy had 3 (and just sold one on EBay for $460). In an email to me he wrote "I HAVE 3 DATES DEC 1968, FEB 1969 APRIL 1969 WINNER GETS HIS PICK IPAID OVER 1500.00 FOR THESE 3 PERFECT INTAKES TO FINISH SOME OF MY CARS AND THEN SOLD ONE OF THE CARS".
Here is the EBay link:
EBay - 3 manifolds, completed auction