1970 6 pack intake and factory style HP exhaust manifolds

[70 sublime]

It seems the 68 69 HP exhaust manifolds are different than the 70 version

Did the 70 version just have a different shape on the out side and a couple bolt mounts for a heater house shield ?

Did any of this heater house stuff get used on a 6 pack set up ?

Did a 70 get these exhaust manifolds but never any covers or did they just get the earlier style that had no provisions for the covers when a 6 pack was used ? 

Just gathering parts for my motor set up and noticed their was a difference

[b5blue]

The shape/angle is different on the passengers side down to exhaust pipe. (So fitted H pipe be different.)