Without a written contract regarding time frame to complete work, not much as far as damages can be sought. The contract should have been initiated at point of delivery.
What he says after the fact is of little or no consequence as it relates to completion.
Best you can do is get your car and all the parts and learn.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.