Since from what Ive read, Dodge shadows and plymouth sundances have pretty bad aerodynamics, 0.42 drag coefficient from most sources, I decided to try a partial grill block. Im kinda wary of blocking everything due to engine overheating.
The plastic is plastic wrap from a delicious Digiorno stuffed crust pizza. It seems fairly durable. I taped in on with clear packing tape. I then moved the front license plate up to the other side of the grill, need to get another ziptie for it.
Depending on how hot it runs I may block more of the grill. I also have that bottom opening to work with, though that may someday provide airflow for an intercooler.