Yeah there was no 428 Tri Power..So its not original to that motor. But the Tri Power alone is worth some money. Depending on what year Tri Power it is. Still worth BUCKS! I sold one 20 years ago for $1100. It was and all original 66 GTO Tri Power. All in good working condition.
As far as 428 motor it’s self, restored that would depend on what its original to. 68- 69 Grand P. My all original 69 Grand Prix cam with a 428. My guess to get big bucks ( again depending) on what its original too ? To my knowledge no GTO‘s or fibers came with 428’s. And no 428’s came with Tri power. That I know of.
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