No doubt, way easier now and heater cores are not alot of money.
Especially if one leaks into the carpet, or bursts and sends hot anti-freeze on the passenger's legs.
If I was going to use this unit I would replace the heater core, but I am not going to use this. That’s why I didn’t use the final seal or all the clips to hold the 2 main pieces together.
I am going to go with a classic auto air unit, which is an entire system with a new heater/ac box.