I would much rather have a shop do this, but these prices seem way out of line, even for a difficult job like an Aerostar.
What's the cost in anyone's area to have this done in an indept shop?
Same type Motorcraft parts retail are $67 total.
Plug wires $66 per set of 6 Labor $204 (slightly lower if done with plugs)
Total $584, less any credit for labor