[Grumpy old man]

I had just repaired my 67 non A/C dash and was a little concered about cutting big holes in it , I found a set of vents on the board and removed the inner plastic so I could use them as a perfect pattern and not have to worry about removing too much metal or having any gaps . I used a cutoff wheel to rough out the opening and then a flap wheel to fine tune it , Worked great .