Failed heater core- '67 Barracuda small block, no A/C.

Its not that hard, the fact that you dont have AC makes it even more easy, just remember there is a J bolt that is inside where the air box door opens and unhook that. Everything else un bolts from the engine bay, you dont have to unhook the lines to the heater boxes switch but do disconnect the electrical connectors to box, also remove the seat for ease of comfort. i did this to my 67 on my lunch break in the parking lot at work. Oriellys sells new aluminum cores i believe its the Murray brand direct fit! Good Luck!