It's a shame you've got the engine compartment all bed-lined (looks great BTW!) if you have to move the hydroboost location to another part of the firewall. From your pictures, it doesn't look as if an angle bracket will fit. A pic, like mine, looking straight down the valve cover, or a pic with a straight edge along the top of the valve cover extending to the firewall, might help.
Another consideration is, although I have to pull my upper intake (6 bolts) I can get the valve cover off with the hydroboost in place.