82 is a great year for USA deans. Is it single ply binding,or multi ply? Is it trans red over a flame top(called the standard series) or trans red over plain mahogany(called the flame series...yeah I know sounds stupid to me too)? Note,the original DFH was trans red over mahogany(the cheaper flame series model)before it was repainted.
If the pickups were changed,was the wiring changed too? Standard wiring from the factory back then had this out of phase thing going on when the selector was in the middle. This get changed often when people change the pickups.
IMO given the info you have provided,it's not a big ticket guitar. Actually,few vintage deans command big bux. If it's not a flame top in minty condition,I doubt you could get more than $1200. Just my opinion. A decked out black caddy with 7 ply binding and gold hardware of the 82 vintage might be able to get to $2k,but it would only come from a collector...who probably already has one in the collection. Dean collectors are few and far between...but they are pretty rabid.
Ps,if you pm me the full serial number,I can text it to my bro who has the complete books from the very beginning of Dean guitars. He could tell you/us when it was made,the specs,and who it was ordered from/sold to and for how much.