Here are some pictures of my car and the bracket that holds the hood. I just need to know if I remove heater core from inside the car or outside

 

It looks like you can get to it from under the hood.

 

Hi, nice 55 Ply You have. My first American car was a 55 Ply 4-door Savoy. I put a 1964 318 along with the 727 and the rear axle. Boy it was great back then in 1979. Sold it in 1985. Today I drive a 1975 Duster Custom witch I bought from Santa Barnbara, CA 4 years ago. Just bought a LD4B intake manifold for the 318 on E-bay. Trying to get in some pictures here later. I live in Finland.