Are 1965 Formula S brakes the same as 1965 Signet convert 273 2 barrel brakes?

489 centers did not come out until 1969, so that is definetly a transplant! Look for the location of the distribution block on the axle tube! Is it up on the hump of the center or down on the drivers side tube a couple inches! On the tube would be a 70 and later unit, on the hump would be 69 and earlier!