im getting ready to do a jet change on my demon. I was wondering if it is possible to change them without removing the carb from the intake? its on a 350 SBC and it appears that the thermostat housing and the coil might be in the way. how much clearnce is needed to get the float bowls off to get to the jets?

should not take more than a1/2 inch or so to pull bowl and metering block off also uses same jets and gaskets as Holley 4150 carb

You will probably need to take the carb off to clean the gaskets off, unless they are reusable gaskets.
If you have to replace the gaskets I would suggest you spend the extra coin and get the reusable ones.

BG carbs use same parts as Holley. They where my favorate carb of choice, to bad they went out of business.

this carb is only a year old so it shouldnt be to bad to do, and recently the compnay that owns holley bought demon and they are back in production