i found a manifold at a junk yard with the numbers 3916313 on it and below it is GM 8 need to know if you have any idea what this fits and if it will fit my 283 heads on my 1965 malibu before i buy it. thanks John.

3916313 was used in 1969 and 1970 on most small block engines in every body of Chevy car. It was installed on 327, 350, and 400 engines, so it should fit just about any small block from 1955-1985.