Am I missing a picture or something? What is what worth?
_________________________________Correction . . . After re-booting, I NOW see the three pictures. There are two Edelbrock 257 intakes on eBay presently. Much depends on who is looking and the time of the year. Have seen good ones go for less than $300 (unusual) and regularly sell for $500. Adapters your picture shows should be a plus for those not wanting to run WCFBs or Holley teapots.
NOTE: my description of a 'GooD' 2x4 or 3x2 aluminum y-block intake is: no messed up female threads (coil mount, bellcrank mount, carburetor stud holes, thermostat housing mount holes); intake ports not modified; no welds; thermostat mounting surface NOT significantly eroded; flanges on each cylinder head side align with a straight edge. -Aluminum intakes removed when above room temperature can warp as you likely know.
The value of the three two set-ups depend on the carbs and intake. I can't make out the intake info. Is it an Edelbrock 573? Too, I'm rusty... What are the carbs? Do they match (same make [Ford or Holley], number or letter series, and venturi size)? That said, some tuners run a primary carb with a larger venturi than the two end carbs for progressive set-ups. The manifold bottom surface where the choke heat tubes go through is another area to look at for cracks or weld repairs. This seems to be more of a problem for the Ford '56 power pack intakes and the '57 Ford 'E' intakes than for the aftermarket make intakes, though.
IF what you have is an Edelbrock 3x2 intake, the 573s USUALLY bring more than the 553s that have smaller ports... Selling prices are regularly in the $300 and up range for the 573s alone, BUT it's AMAZING how many of them are regularly offered on eBay.
Other Forum members may have other thoughts to share.
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York