No.
A Dodge B250 Van does not have a mass airflow sensor.
I have a 1989 Dodge B250...it has overdrive
No.
Center of the firewall.
check the coil , and ecm and all connections
Yes
ecm just replaced mine 1994 dodge van b2500
Yes.
It is inside the distributor.
voltage regulator is part of the engine computer
Black box under the hood by the battery