I think that year and the next couple of years the 327 was available in 3 different horsepower ratings… maybe 325, 350, 375… but I am pushing my old memory on those numbers
In 1965 the 327 was available in the following horsepower ratings: 250 300 350- Holley 4 bbl./ hydraulic lifters 365- Carter AFB 4 bbl./ solid lifters 375- Rochester fuel injection/ solid lifters