My New 1969 Barracuda

So I've started my want/need list and general project listing and......I'd forgotten just how much a classic needs when you first bring it home! Haven't had one in probably 15 or 17 years.

First up - pull a bunch of the interior to clean up after the heater core puked antifreeze all throughout the passenger side carpet, then refurbish the heater box and put in a new core. Anyone used the Detroit Muscle Technologies gasket/seal kits? Are they quality?