Help with 1970 Dart restoration please.

IMHO... I'd get most of the stuff you want to put on the car before paint, painted first, and then install it. Have the bolts painted stuck in a cardboard box at the same time. My 70 GT is going to the shop like this:
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and all the rest is painted separately at the same time and then installed afterwards

By the way, don't want to sound like an idiot but what is the difference between a GT Dart and a Swinger? Was is a 318 engine?

My dart is a 340 Swinger. Are there 340 GT Darts?