1978 318 heads? Small port? Or large
That's the thing. Those big port 318s would have had WAY under 8:1 compression. Not too spiffy for a police car.
Like I said........I am just speaking from what I have seen. I am quite sure that's not the end all be all.
One thing I have learned with Chrysler is to never say never.......but that's kinda tough to do when you never seen it.