Trouble starting up 67 GTS Dart After winter storage.

you probably timed it wrong, likely retarded. What do you have for distributor, IE breaker points or breakerless?

You can time a breaker points distro almost exactly, by ---after setting the dist back in, rotate the housing CW (retard) then with the key on or some other indicator, slowly rotate the dist CCW (advance) until you get a spark or test lamp. This is with the timing marks placed where you want the timing IE 10-15BTDC etc

Breakerless, similar except visually line up reluctor/ pickup core

You can CHECK timing with a light when cranking on the starter. I knew this and have done this, but Crackedback posted that some time ago and reminded the old guy

As usual.......compression, spark, fuel

You have compression? Try a little squirt of oil, maybe the rings are not getting enough to make compresson. Gives you a chance to check the plugs for condition

Spark........Check the spark, rig a gap or plug direct to the coil and check while twisting the key. Should be a nice fat spark at least 3/8" and MUST BE IN TIME

Fuel.......fresh fuel? You sure the tank is not stale? squirt a bit down the throats directly