I hadn't heard or knew about the Lancer on those cars
I bought and owned a 1959 Coronet 2 door hardtop with the 326 C.I Poly 2 barrel single exhaust motor that looked exactly like the 1959 318 Plymouth motor, I swap the two barrel intake and carb to guy for the 4 barrel intake and carb off of his parents 1959 Plymouth wagon and had dual exhaust with cut outs added to it. It had the two speed push button Powerflyte tranny, radio and heater and the same speedometer as your cars, not the fancy mirror though
That car ended up with a 1957 392 Chrysler hemi with a 3 speed stick shift in it after I sold it the first time