I did it on my 4th gen, same exact thing though. I chose not to buy a kit and do it myself.J
Just grabbed a hole saw slightly larger than the heater hose, drilled my holes based of measuring the heater core tubes and looking at bbc cover photos.
To fill the old holes I took the factory foam/rubber "gasket" piece, took expanding spray foam and filled the holes, waited for it to dry, shave flat and painted black! works perfectly!!
'77 Chevy Nova
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