Offenhauser port o sonic intake

Hello everyone. I am on the hunt for a nice, clean unmodified offenhauser port o sonic intake. I can buy it outright or swap a clean unmodified edelbrock performer or a factory iron 73' 340 TQ intake with a brand new NOS choke thermostat. I will trade both for the port o sonic if it is really nice. Thank you group! Lee Sousa in RI.