heater core instructions

so i started on this today and hopefully i can have it together by tomorrow i kindof got stuck at this point. if any of you did your heater cores, is this dash far enough to change it? i can see the heater core hoses but i have no idea how to remove this big air unit thing. any kindof help would...

I have read several posts here can't see instructions on how to remove dash for heater core. I have tried everything including flushing 3 times. If anyone has instructions on repair would appreciate greatly... Go Cubbies