Heater Core Qestion

[dbf]

Patient-1982 Coupe

Background-Over the past couple of weeks (since getting cooler), the coupe has shown the definite signs of heater core failure. By that I mean, little heat, slight sweet smell and fogging of the windows after running hot and shutting the engine off. I just checked and there is antifreeze dripping out of the heat exchange box. Now, to make things extremely easy, I removed all AC components (both inside and outside of the car) after I bought the car 3 years ago, so I can see the cover for the heater core along with the supply and return lines from the cooling system.

My question is, is the core just slid into the "groove", or are there any fasteners holding it in place? I'll hopefully pick one up this week and R&R it. Any BTDTs? 

TIA, and Happy Holidays. 
Dan