need opinions cowl plenum

[greg5436]

a guy is repoping them now for 650.00 on team chevelle and ebay.someone did a little smoothing on the firewall of my 69 conv. so i found an original one and installed it.i did cut out the firewall and put it on like it should be installed.when the top is up you can hear it sucking air inside the car.i just happened to have another all original one for a 69 chevelle sitting on the shelf.still has original staples and rubber.my engine compartment gets alot of attention from that air cleaner.it's a part that you would never take off once installed.also you can cut out the bottom of the fiberglass duct and not touch your firewall. greg