67 should have a screw on end that looks like the end on the transmission but smaller.
On my dart I can (just barely) unscrew the end and once it's free it's not hard to pull it to the side.
Removing the drivers seat is a huge help. It's only 4 nuts
From there you can pull the inner cable out.
Remove the trans end of the outer housing will make things easier.
You may need to spray some cleaner down the housing (be carefully about the type of cleaner that it is comparable with the housing)
Then clean and lube the inner cable.