[TC223]

Good Morning folks!
Working on a 69' Firebird, 350/Automatic/w/Air and in the process of tackling the Heater core. the car hasn't been touched in 30 years but I've so far got a cool collection of mouse skulls and insulation nests.

The car has A/C so there's a lot going on under dash. I don't want to dig into the heater core until I've got some reference factory material in hand. So my question is, can anyone recommend a USEFUL repair manual? I'm seeing links on amazon, etc but I don't want one that's got horrible copies that aren't legible.

Also, if anyone knows a specific vendor they ordered theirs from and is happy with what they received, I'm open to suggestions!

Thanks!