I went thru this exercise a few months ago. I have the same pan. When I bought it, Canton/Summit listed it as a 7 qt pan. Now it is listed as 8 qt on Summit and 9 qt on Canton (last time I checked). Since I didn’t want to take the pan back off, I did some dimensional math and finally decided that for normal around town spirited driving, I would add 7 qts to the pan (plus whatever extra I can fit in the
oil filter). If I am going racing, I’ll add another quart. Never had a problem with this. Once I tried to add the 9 quarts (since all 9 quarts will fit in the pan and not touch the crank) but it started leaking
oil out of the timing cover seal.