How to change the heater core in a 1985 chevey camaro z28?

i have a new one and the guy i bought the computer from took the heater core out already and now i donty know where to put the new one in at.How to change the heater core in a 1985 chevey camaro z28?start by popping the hood, take a screw driver to the heater hoses. get you i think a 10mm and start taking out screws.once you get that done tug on the box and boom,you'll see the old core, replace everything. reconnect the heater hoses. it only took me 15 minutes to do it in my 86 Z28.How to change the heater core in a 1985 chevey camaro z28?Buy a 1987 Camaro Z28!How to change the heater core in a 1985 chevey camaro z28?Try under the dash