As stated above, 3892657 casting was used for 302, 327 and 350 engines. Your engine ID code translates as:
V = Flint
04 = April
25 = Day
HF = was used in 1965 for 300 horsepower 327 in Corvettes, in 1966 for 275 horse 327 w/Powerglide in full size cars, 1969 275 horse 350 (2 barrel carb) and lastly in 1978 170 horse 350 in Firebirds.