Here is an Ebay auction for a used Hipo 289 carburetor spacer without PCV by Ebay member "magmustangs" with a starting bid of $106.00:
1964-1965 Ford Mustang, Shelby GT-350, Falcon, Fairlane, Ranchero, Mercury Comet, Cyclone. ORIGINAL 4V CARBURETOR SPACER For 289 Engine. No PCV Provision. The rear port nipple is Not factory bored for a PCV breather. This spacer has a 1" HEIGHT. .. This is an ORIGINAL FORD PART. Casting Number C4OE-9A589-B and (FoMoCo). Removed from an Early 65 Mustang 289 Hipo Motor. This Spacer is in Great Original Condition. It is Straight. Has a Natural Metal Finish and Looks Great. Smooth Gasket Surfaces. No Build-Up on the inside at all. No Cracks. No rust or corrosion. Overall, this is a Great Original 289 4V Carburetor Spacer. Very Hard To Find Original. Please email with questions.