Vizard suggests that a close approximate can be had in some cases by looking at the relationship between the main jet flow area and the A/F.
If it shows 14.0 with a #72 (not .072"!) jet and you need 13.5, 14 / 13.5 = 1.037. 72 X 1.037 = 74.7.
Obviously, with a Holley the WOT fuel area is both the PVCR + MJ, etc.
