As mentioned above, the square jets will still be a little fat. Contacting Monte will be your best bet! I use his tune-ups, and am currently running a 71 N / 55 F with 6.5psi for right around 12:1 A/F ratio on my Big Block Stroker.

I am not saying this is the tune-up you should run, but it is just a reference to show you how FAT your tune will be square jetted. I am in Colorado, so have to deal with thin air.