my boy called me last night, finally got the new stroked 440 ready for break in! said he fired it up briefly the night before and it ran for a minute and stalled, no spark! replaced the coil with a new internal resistor and retried it next night ran 10 mins just getting to temp [cold here} and quit again ,no spark! He's running the box from the original 318 which had no issues [ I assume there all the same except rpm limit} I really have no answers for him, I've owned mopars but never had ignition problems! I told him to disconnect the old tach[grasping here, never really heard of one that lets the engine fire then quit} He will be trying again tonight if anybody has any ideas about the issue! He says the motor sounds great until it quits, now he's worried about the cam getting messed up with this intermittent run in! says the motor runs 70- 80psi oil on start up am worried it will blow the filter apart!