Here is a general range based on current market trends and previous sale data:
- Fair to Good Condition: $10,000 to $18,000
- Very Good to Excellent Condition: $18,000 to $25,000
- Exceptional or Restored Condition with Historical Significance: $35,000 and above
It's important to note that these values can fluctuate based on specific factors such as the availability of similar engines in the market, any recent maintenance or restoration work performed, and the demand from collectors or enthusiasts. If you're interested in buying or selling a 1964 Ford 427 dual-carb motor, it's recommended to consult with classic car experts or reputable dealers who specialize in vintage Ford parts to get a more accurate estimate based on the current market conditions and the motor's specific details.