Mine shows N41, but not certain it is the same for '75. Probably, but not certain. The engine code should be E58, something else to verify. Probably have to crawl under it and see if the factory hanger for the PS muffler is there if the code doesn't show on the fender tag, like
@340sFastback mentioned.
Reason I ask is I used to think the E-58 HP 360 stopped after '74, but I have started doubting that recently. It looks like the dealership data books don't list the option for the E-58 motor for the A-Bodies in '75-76, but the engineering pages do and make reference to a high performance cam and dual exhaust, and for compact models only. There is also an E-58 motor available for non-compact cars that was an HD option, but not an HP option. It had a 4bbl, but single exhaust and no comment about the cam.
View attachment 1716498722
The weird thing (to me) is that in '75 catalytic converters were mandated, which would mean dual exhaust wasn't an option. Unless they had dual cat's and the floor wasn't modified for that. Which means in '75 (and '76) maybe they had a way around that somehow. That is if they truly offered a dual exhaust motor in those years.
Thus my question.
Edit - not trying to take anything away from your car. It's a beautiful car either way, and probably rarer than my '74.