Everything I've heard or read points at the exhaust manifolds that came with 69 340 X heads as being the very best flowing of all era correct manifolds.
If I has a early A I would be looking at 95 Cherokee, Dakota/Durango manifolds.
After all anything other than stock is going to require some grinding,etc.. for fitment.
The only difference is cost. Those 340 manifolds are priced like gold while the late model manifolds can be had for a song.
Anything will be better than stock. Your left side manifold has a wierd little crook in the dump end that really resricts flow. A member names Lars said it best, "Like pooping through a straw". LOL