Looking at your picture makes sense too. It was set up for towing.
Pretty sure that’s it.
What happened to the original 428?
What are the specs of the 390 in it?
So many questions.
Yep, that's the couple I sold it too, they were in a trailer club. Original owners lived up the street, bought it to tow their horses to shows with 4 kids. A guy in Petaluma had a 7 Litre that matched the date of the engine and just had to have it. I got that 390 over in Marin, just a nice build, could see the 2291 on the pistons with my borescope. Are the 428 fender emblems missing? hehehe... It had been sitting in the horse barn since 1989, had it running in 20 min. It went through at least one more owner up here that I see at Petaluma swap every year. Pretty sure I still have the records since new, the original owner was way past anal about that stuff