Magnum manifolds and power steering
As you can see with these 318 (blue) and 340/360 gaskets, if you turn the manifold upside down the exhaust port shape won't match the head port shape:
Treblig
If you're asking if you can use those magnum manifolds on the driver's side with the exhaust port pointed down to the rear the answer is "no" on a Mopar engine and yes on a Jeep engine. The reason is that Jeeps have the starter on the passenger's side which leaves a space for the driver's manifold to occupy. The Mopar engine has the starter on the driver's side which interferes with the Jeep magnum manifold. I tried for 3 days to get one to fit on a 69 Barracuda (318). Once I got the engine high enough to get the manifold all the way into the engine bay the manifold was making hard contact on top of the starter with no way to get it to bolt up. I found that if you want good flow you have to use the 70's 340 driver's manifold and a 96/97/98 Jeep Grand Cherokee passenger's manifold (30-50 bucks) on the passenger's side. Now you could also try to install a Jeep magnum passenger's manifold on the driver's side with the exhaust port pointed down towards the front of the engine but you'd have a heck of time routing the exhaust past the steering box and cross member. You have to remember that the head exhaust ports are not symmetrical "top to bottom" so I have no idea good a seal you get and how much flow you get when you mount the manifold upside down.
As you can see with these 318 (blue) and 340/360 gaskets, if you turn the manifold upside down the exhaust port shape won't match the head port shape:
Treblig
