I believe it would be a 24 based on what I read with my timing lighjt. I am running 10 initial. Its been a long time since I fooled with this stuff. But, from what I remember on the cars I used to have the more intial you ran helped low end. So I would think I could go a little taller on the prop. But to much total kills top end. I believe on my elcamino I was at 20 intial and 36 total, buts its been a while
So, your saying more initial will give me better response?