383 commando ..whats it worth?

yeah i actually dont remember hearing of a commando till the other day, he made it seem like it might be something special, i thought maybe that was something more then the normal 383, thus i knew you guys would know if it was worth it. the motor that is in the duster right now is way to radical for my needs, i could pull that and have that redone, but its a purpose built race motor and i hate to undo that when i could probably just sell it and redo another motor and the person who would get the current motor would be happy too, but it may come to me just having this one redone, im just not sure at this point what all has been done inside this one. the things i do know is its 12.5 to 1, 650 lift(comp cam part number 23-630-5), im not sure how opened up the heads are. i also know the motor( supposedly) came out of a 68 gtx. I also have another set of heads here that do need redoing.