How much is it worth?

From the Hagerty valuation page:
CURRENT & HISTORICAL VALUES
View current vehicle values and see how they’ve changed over time in a 3-year, 5-year and to-date intervals. Compare these values to other vehicles and benchmark financial indices.
Current Values

• #2 Excellent$20,500
• #3 Good$14,500
• #4 Fair$10,100

Value Adjustments
-30% or 6-cyl. +15% for 4-spd.


So $14,500 for a car in good condition minus the 30% for six cyl puts you at $10,150. Right near your $11,000 with a little wiggle room or slightly higher for being a touch above "good" condition.