M Code '69 Dart GTS

I'm getting the chance to buy an original M Code '69 Dart GTS 440 car. I'm having a hard time determining what these cars are worth today. Anybody on here have some recent experience or know or have an opinion about what the M Codes are going for in todays market in any condition?
Thanks for any insight!
So many variables...all the hard-to-find parts there?, condition?, numbers?, etc....hard to put a value without pics and a GOOD description.