valkyrie,
According to Flaydermans guide, 7 th ed., Cal. .45/90 adds 25% value to a standard '86, while the oct. bbl. does not (too common). Anyway, your description should put it at a "Very Good" condition, and be worth $1062 (+).
That's selling price, not buying price. A dealer would ask at least 50% more.
OK, so how much did you give for it? :roll: