We might be getting somewhere here. It's a brand-new engine. My assumption is that the distributor is the newest MP (mallory) unit that E-berg and others have said has a really hard time keeping timing stable at idle.
https://board.moparts.org/ubbthreads/show...rue#Post8230660Go back and read some of the posts about this, or email E-berg and ask him directly, he sometimes answers posts.
The camshaft at 230 intake duration is not that big, it is ground 4 degrees advanced, so intake centerline is 106 on a 110 LSA.
Check the ignition first. There's nothing wrong with the MP electronics, but the distributor thing might be the culprit. That'd be the one with the bronze colored shaft end (where the rotor goes.) If so, swapping on any other distributor, even one out of a 1974 Dart, should make a real difference.
Then you would indeed buy and put in an MSD electronic distribut or Firecore, you can hook it to the MP box or use the MSD-6 or whatever.
For example:
https://www.customwiresets.com/product.php?productid=16293&cat=252&page=1 R.
