Considering your case I would think that it would probably assist your resale. This is based on the fact that Vipers are mileage sensitive for resale, though most of us feel this is unwarranted. The rebuild will offset some of that to prospective buyers, as ARROW is very well respected, but do not get into an issue about mileage. The car has 42k, and will always have 42k, so refrain from discussing mileage, just mention that the engine had an Arrow rebuild at said time. Best of luck.