Is building a stroked 318 better than a stroked 340/360?

Bore/stroke/rod ratios don't mean squat for the Average build
Stop worrying about that stuff and think about the big stuff. Displacement, airflow are big things.
True, but if you can design them into your build without too much added expense doesn't hurt.
The last thing Mopar had in mind was the 318, when the G3 hemi was designed.
But really the rotating assembly is basically similar, they started with the basics bones of the A engine and built upon it. Just really mainly different head packages from poly, wedge, magnum, hemi on the similar basic rotating assembly. How I look at it anyways.