I love this idea that Mopars are so outdated, that you should only run 1.5 rockers. If that were the case, I could make the argument that you should only run a flat tappet cam, because big blocks never came from the factory with a roller cam. A roller cam has the ability to increase area under the curve with the same seat timing, which is exactly what a higher ratio rocker does. For that matter, the dinosaur Mopar engines never had roller rockers from the factory, so you shouldn't be running those either. Forget about aluminum heads and manifolds. Headers, no way!

I almost never use a 1.5 ratio rocker on my Mopar builds, and I don't seem to be hurting for power, reliability, or stabilty. I put the shafts in the right place, and it makes the rocker to valve geometry correct. There is no roller rocker that can be bolted to the cast in stands, and have proper geometry, no matter how much they are marketed as such. Do a Google search for Mopar rocker geometry. There are some good tech articles available, as well as some not so good. Use logic and common sense to separate the two.

As far as pushrods are concerned, you can get away with less pushrod when the rest of the valvetrain is stable. A smooth stable valvetrain puts less of a pounding on its individual parts.

In response to Polyspherics comment about Miller, if you study his (Millers) explanation of geometry, he tells you that even though the pushrod side may not be correct on other rocker brands, and is difficult to change, the valve side is far more important. So, if you don't correct the valve side, you lose twice. Also, I'll share a little secret. Miller's patent expired over 20 years ago.

Run the 1.6s with the shafts in the right place, and you won't have excessive guide wear or instability issues.