1965 Barracuda 273 rebuild...intake code?

I am in the process of rebuilding my 273 -4 barrel engine and have found code numbers to verify the heads and block as correct and original...but the intake manifold is an odd number
4100340, that I can't seem to match up. and looks like it should be for a 340 or spreadbore carb setup. Can anyone help me on this please?