hah i wouldnt worry bout an amp at the moment but a couple of yellowtop batteries in your trunk first.. not to mention a h/o alternator swap but match rms. with rms of amp.. dont have to be exact just try to not go over the rms, you probably will need 3-4 amps to push your (8) subs..
they should say right on them what ohm rating they are. if they have 2 sets of connectors then they are dvc (dual voice coil). Is it possible to do research on your subs via google search??