The cost of non matching numbers car?

[Andre]

Its a Signet gold car with parchment interior and an ivory vinyl top. Very stunning in person. Added red wheel well liners and ralley 1 wheels really make the car pop. Factory working A/C car. The car is a perfect body off frame detailed restoration top to bottom and I don't use that term loosely. My only issue is the non original but correct year and date code engine block so I'm trying to establish a fair price. Thanks to all that replied! Keep them coming.