There is also a split 8-stack Weber intake that uses a valley cover. They're sensitive to throttle linkage routing, whether carbed or EFI. One friend had EFI on such an intake pair and it was subject to idle creep when hot. The cold idle was 900 rpm but when it warmed up, the idle always crept up to about 1200 rpm.
On a dyno, someone finally found that the two banks of EFI throttle bodies were linked by rods, heims and a bellcrank in the valley. With aluminum heads when hot, the two heads (and intakes) expanded away from each other enough to pull on the linking rod connections, which increased the idle by about 300 more rpms.
He had to figure out a different method of linking the two sets of throttle bodies using cables..I think the original linkage would have done the same with carbs, on those heads. Iron heads apparently don't expand that much. An aluminum block would likely be worse. Fun with 8-stacks....