Need 1966 Dart GT Hypo Info

Mike, thanks for the info, much appreciated. I am in negotiations with the owner, a friend I have known for 45 years, he had the car for 20years. So this will make it easier. I was looking for a B5 blue 1969 swinger 340, done or project, like the one I had in 71-72. I am more familiar with that car and B-bodies from that era like my '68 GTX. Will post pics if the deal goes through. Again thanks for the info. Bob.
M
mike, I just got the vin on the '66 dart GT. LM23D62------ I know the D is for the engine, but the decoders I am using say 273-2bbl. Non of the decoders show a 273-4bbl. You seem to be knowledgable in this vehicle and any help is greatly appreciated. Bob.