My guess would be that they don't know because they're use to using hydraulic clutches that do not have release arms. Not to mention, it may also be uncommon for people to order that bellhousing for use in an A-body.
Yes, I sure understand and had also thought about the hydraulic slave cylinder issue since many of these businesses suggest using internal hydraulic slaves. But, when a manufacturer designs a bell housing that has features for a clutch arm, a clutch arm pivot and an inspection cover, you surely know what you've designed them for. You can't have mounting holes for these mating parts without that knowledge. Also, this bell housing is a "universal" part meant to fit a small block and TKO and isn't tied to any specific vehicle platform. Thanks, - EM
