Excal's only came with 302's. ANY other engine indicates the car was either modified after production or was one of the very few cars left over after the factory closed and was completed by an individual. In either case it is not compliant with Calif or Federal law and would require SB100 or some other registration method.
EDIT:
I defer to my esteemed colleage, Ohekk, keeper of the Excalibur flame!
