I've never understoof the emphasis that Mopar guys seem to put on rod ratio. It's much lower in list of priority for proffessional engine builders and race teams.
Are you familiar with Bruce Robertson? he made this statement to me about it:
With the Chrysler engine having a long rod ratio the piston dwells for longer at TDC so the opportunity for a dished piston is there for a different reason than a Chev etc. Dishing the piston gives a better chamber because the flame kernel is further way from metal in every direction so thats good.
It makes the plug more central when viewed from the side if you get what I mean. But the reason for doing it with a Chrysler is different to a Chev. Doing it in the Chrysler long rod engine is not just that the piston clearance is there but its to create a longer flame path before the flame extinguishes against a surface while the rod is dwelling at TDC. 1.8 stroke rod ratio motors are different gas production to shorter rod ratio motors. They have more complete burn with less HC wastage. they are awesome to work with, unfortunately theres not much Chrysler racing stuff here in Oz.