Those stacks are a good fit for those carbs. I can tell you from my own experience with ITBs though that if there is ANY possibility of something coming apart (due to vibration, thermal cycling, etc.) it WILL. Looking at how the horns are pressed over the flange on the carb, I think there is still some possibility for them to work loose from the flange because of the taper that's created as the end of the horns flares out to fit over the flange. Just adding a clamp of some sort may help or it may not. One way to address this if they do end up working loose would be to cut some very short slots in the end of the stack (shorter than the ones that are already there) to make some small "tabs" that you can bend in so that they lock onto the lip on the carb flange. Then when you add a clamp it will compress the tabs to keep them from bending back out, and cover all the slots so you can't see them.
So how much room will you have from the stacks to the firewall? Looks like not much unless you have a really short manifold.
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