$27 isn't a bad price for such a multi-pin connector pair. Max gage is 14 awg, which is too small for the thick ALT & BAT leads, if you keep your dash ammeter active. But, you can run those separately, as in the factory's "fleet bypass".
I thought it was reasonable too... first noticed this type of bulkhead connector on my '87 International big-truck.
My Dart is a (very slow) work in progress... there is now a CS-130 alternator ($20 at a swapmeet, tested and works great), and the battery is in the trunk along with the starter and main power solenoids (and a cutoff switch). The large cables for the starter and alternator run through separate grommets, not the bulkhead connector.
I remade the dash cluster, and decided to dispense with the ammeter and use a voltmeter instead (another flea-market special, possibly from a small airplane). Here's what I had room for. The tach is going on the column or the dash.