Mine is under the dash where you can't see it, and only the two coil wires (black/orange inside black sheath) and the two pick up wires (purple/green in black sheath) go into the engine compartmet through a grommet on the firewall.
Had to extend large red battery wire as well, that is almost a given.
If you do not like stacking ring terminals on the solenoid post (I HATE that), then run one larger (8 guage or so) wire from the bat side solenoid post to a large terminal stud, (available from custom stereo shops and under the hood of many GM FWD cars) and stack the terminals on it instead. I always do everything I can to eliminate any wires under the hood.