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Cool it's a 455 Stick also love the Mondello touch!
Not so keen on T-Roofs myself also I believe they were '75 up so unless something special, were later added/roof clipped?
As to the nose, I fixed lots of these back in the day and two different header styles were actually used both 73/74 so although this one looks '74, it's actually a '73 Supreme nose w/o running lights between headlights/grilles like 74's had also correct '73 only no side marker lamp fenders/under bumper grille continuations/corner lamps so likely all original w/ only the 442 Hood added.
~ Pete
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