I've tried to figure out the same on both my cars (78' Malibu wagon-79' 2dr Malibu) and I just don't see how it would be possible.
An 8 point will fit alright,but there's to many things associated with the dash that are just in the way.Your blinker box and fuse box are right in the path to the frame outside where the bar runs.
You might relocate the fuse box,but loose your blinker box :?:
Then on the other side (passenger) it's about as impossible.
I don't see any benefit if you even try running the bars low to even installing a ten point.
The idea to having the ten point is to link the front horns to provide extra strength on the front upper cage bars,and to try and prevent the engine from entering the drivers compartment on front collisions .
Maybe someone else has a better answer,but this is just coming from my observations on the same question :?