These are the numbers off a 348 BB. Looks like a 409 BB.
T0429H
3755111
D1660
Manifold numbers
3732757
C1860
What is this worth, it was just rebuilt ready to run?
Thank you for the help.

Why don't you go over to a 348/409 site and ask this b/c imho, it's worth whatever both you and the buyer are happy with AND that doesn't help you AT ALL!!

pdq67

Hemmings usually has a few ads for 348's but that doesn't really mean they are worth what they ask for them. It might give you a base to work from, though.