Actually, the salesman didn't know what a "P code" car was. My impression was that he was a nice guy who has little knowledge about vintage cars and took the word of the fellow that sold it to him that it was all original, etc.
The engine block in the car was a C6ME which was a standard 428 hydraulic lifter block for 1966-68. The 390 & 428 Police Interceptor motors were solid lifter blocks. For a 1964 the PI motor was a 390 and the block would have been a C4AE-F. In 1966 the PI motors were 428s and used blocks C6AE-B and C6AE-F. The engine in the car had the original valve covers with the 390 HiPo decals and the intake part number began with C3 so I guess it may have had the original intake also. I didn't look at the carb. I hope this helps.
