where to drill a 2 inch hole in cowl

I had lots of west texas clay sand packed in my cowl on my 67. I pulled out the heater box, and fresh air box on drivers side, fenders were off the car, you may want to take your fenders off as well because im willing to bet the bottom of them are packed with pine needles and rotting plant matter anyways. Will eat out the lower fenders.

I have an extra long blow gun i got off my local matco truck. Its a metal tube about 2 feet long with a trigger and curved end. Once you get heater box and fresh air box out, and remove fenders for cleaning shove it in there from the vent holes and anywhere you can gain access and blow blow blow, the amount of S#&T thats gonna.shoot outta there will amaze you. I got about 8 pounds of dirt and sand out of mine LOL.

Hope this helps
Matt