I don't know if I would trust a re-drilled. Does the seller have a flow sheet with them? If not, would he mind having them sent out and flowed. Cleaninjectors.com will flow them only (not cleaned) for $25. Speak to Tim through e-mail(tim@cleaninjectors.com). My info is about a year old, so Tim may not be there or price may have changed since then. It took about 10 days to ship them/have them flowed/ground ship them back. Have they been run since the re-drill?
To answer the questions:
Yes they will work in your car, if they are the proper impedance. I believe ours are low impedance, but someone will need to verify that.
Driftmotion carries clips that will fit them.