Your original statement said the drivers side and both of those are passenger side manifolds.
The magnum manifolds are said to flow more so it would be a no brainer which one to use. The ‘92 magnum manifolds had a 2.5” exit, had a couple pairs back when they were new.
I can offer no advice on fitment of a drivers side setup as my only early A body had a 340 and fenderwell headers when I got the car.
