Whats my 72 dart swinger worth?

I have the tubs just havent got to weld them in. Been to busy, motor was re-ringed 44,000 miles ago, has 596 heads that are milled to 61 cc's and they were polished not ported,has 9.3:1 comp ratio everything but the block, rods, are new. It has a brand new mp distributor wires msd coil, minus the chrome box. New eddy carb, affco radiator. The car starts and runs no problems at all.
Has four link setup, with coilovers.

Also has durango buckets and original rear bench that i have new covers for. Pretty much needs the carpet and dash pad. Has b&m quicksilver shifter as well. Dmv's site says an estimate of 143 last time i checked, which was 5 months ago . Dont know how much its went up. Will check tommorow other than that i cant be any clearer about the car. Ive been offered 5k but that was from someone that just got his taxes and had money to blow.
I just have no idea what its worth. Oh also has all new glass except for the wings