If Boeing wins with 767 it will extend Spirit's production of 767 nose section at around $4 million per unit. The production rate will probably never go above 2 units per month. It's a small part of Spirit's revenue stream.

If Boeing wins with 777 then it helps Spirit more because the 767 will shut down which will reduce inventory and free up floor space. The incremental increase in 777 production will help because those units are worth around $7 million each.