How much more is it worth?

I have a 1969 dart GTS 340 four-speed convertible. 1 of 58 ever built. I have restored the car and have a period correct 340 in it with the matching numbers transmission. I have the matching numbers block but it has two cracks in it from the previous owner letting it sit out in the winter and freezing up. My machine shop said it can probably be fixed, they need to inspect it, and they said it will be expensive, 3CF22D54-4BA8-4C6F-9ADD-2EE176EDD867.jpeg 8BEFFFB1-09D2-42A1-B965-12B3B88F2AB5.jpeg 84C8C76A-C1CE-495F-93B6-4D8D5F55BA41.jpeg E8AF10CB-BCAB-4FAA-9A13-12416B8F3341.jpeg but their question was how much more is the car worth with the matching number engine?