Ok, one more question on the Holley jetting.

True, but I'd be looking at a very thin strand of wire since I am not trying to make major changes now. And the calculation doesn't always agree with the actual flow once drilled, either!
After going to the trouble of removing the metering block, it's not hard just to drill a new set screw (I have lots of them) and thread it in and try it. When it's right i can just leave it :)