I have to run tall covers to clear stud girdles and I plan on switching to a smaller diameter dual diaphragm booster for clearance. CanI use an 8" dual or will I have to go down to a 7"?

I am going to be low on vacuum so if the bigger booster will fit, I'd rather go that way. Watcha think?

Here's a pic; tall sbc covers to dual 8 booster.

Thanks for the pic. After doing some poking around, it looks like I will be going with an 8" dual. Now I just have to confirm that the 1.125" bore master cylinder is right for my stock type disc/drum setup.