Holley/Demon Carb stumble
You have a Demon and Proform baseplate on hand now, no?
If one were curious enough, and had some time to kill....... they could do a little side-by-side look see.
The only time Ive run into the situation where the idle feed ports don’t line up between the body and the baseplate was when I’d modify a 750 to use an 850 baseplate.
When doing that, you had to slot the holes in either the main body or baseplate.
But that was prior to the arrival of the Holley HP950 carbs.
I’m not saying whether the Holley and Demon have the holes in the same place or not........ but I’ve never noticed it.
The BG 190004 kit worked on Holleys, Claws, and Demons......with different throttle bore sizes, so there is a variety of baseplate gaskets in the kit.
I just matched up which one I needed and forged ahead.
I never noticed if there were ones that had only those idle feed holes relocated.