My father in law has a 69 convertible in his garage and I’m trying to figure out what engine it came with. The tag on the center console says 390hp 454 10.25:1 comp and 500 ft/lb torque. My understanding is that the 454 wasn’t available in 69 (should be 427). I’m not sure if the tag was added. Is there a way to figure out what it came from the factory with? This is the trim tag and the vin tells me it is #6,527 built in 69.