1965 Barracuda 273 rebuild...intake code?

I need help again! I need a thermostat housing for the intake manifold that was previously installed on my 273 V8 LA block, casting number #4100340 (thermoquad or spreadbore type), (see first page of this post). The bolt holes center to center are smaller than most small block holes. They measure 2 7/8 inch center to center, most others are 3.25 . Can anyone help me on this please?