You have a 396/325 with a Rochester Q-Jet and a Turbo 400. The engine was assembled at the Tonawanda, NY engine plant on February 28th, 1966 and installed in a 1966 full size car built at the Arlington, TX factory. The casting number should be 3855961 which was used in 1965 and 1966. (The 1967 casting number would be 3902406.)
And yes, it's not unusual to see 1966 VIN stamps with different fonts and/or sizes.