4 barrel intake

They're the same orientation as the 4 bbls.

The carburetor I have on my manifold is mounted front primaries and rear secondaries.

The left side primary and secondary feed cylinders 1,4,6,7 and the right primary and secondary feeds cylinders 2,3,5,8. There is a notch in the manifold between the primaries for balance.

Triple checked this. Primary holes are slightly smaller then the secondaries.

This is the X3195532C. I thought the casting number was X3195582C but the last 3 had painted over casting flash on further investigation, so the 3 looked like an 8, I'll update that post tomorrow with pictures and dimensions.

The last version of the two bbl had the venturis side-by-side, left and right. The bowl to the front, one venturi on the left away from the engine and the other on the right closer to the engine.
So when sitting in the car, one on the left and one on the right.

The early intakes had the carb sitting so that one was to the front of the engine and the other to the rear of the engine. On a two bbl it matters almost not at all.

He's asking why the 4bbl intake has the carb mounted "sideways" instead of the same orientation as a carb on a V8

You installed the 4bbl "sideways" and not like the carb on a V8 by your own description - like the early two bbl intakes. 
He's asking why are the four bbl sideways.

I explained the reason - so the front cylinders are exposed to a primary and a secondary and the rear cylinders are exposed to a primary and a secondary.
To have a four bbl mounted on a six the same way as it is on a v8 would mean the primaries would be closer to the front three and the secondaries closer to the rear three cylinders.

A six is long and the manifold is long - the sideways 4bbl puts the primaries smack in the middle and the secondaries in the middle instead of primaries being closer to the front.
That's the answer to his original question.