how do you replace a heater core on a 1993 chevy caprice wagon with a 5.7L 350

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when I bought the car the previous owner mentioned it needed a heater core. upon a closer look, I noticed it was not holding water after long periods of travel. as soon as the car was shut off it would leak antifreeze. that is when I saw that the heater core lines had ben cut about 3" coming from the core and firewall itself. I also found the hose was missing that went to the block itself. I plugged the two hoses for now and fixed the hose that should have been going into the block and no more fluid leak, but I still need to get a heater core ASAP