A-Body Heater Core Replacement

[BrettS872]

Ahh, yes - you guessed it: the dreaded chore of replacing a 50 year old part that's buried in the car.

I'm about halfway through it (definitely had to walk away a couple times) and have that elusive firewall bolt left to remove, as well as the heater cables and ultimately the box/core.

I have all the hardware I'll need to reinstall, along with a re-cored Harrison unit. What I would like to not have to do is drop the inner fender and I'm definitely NOT drilling any holes in the car to access that nut.

That said, do you A-Body guys have any tips to pass along? I'm going to try and get most of this finished up tomorrow afternoon.

Thanks in advance!