i've put two already in FE's. i wouldn't put one in a hydraulic block though.
the old school isky kit, you drill and tap the
oil galley and thats where the bars attach to hold the secondary springs. the hydraulic blocks are a bit weak there since there's the
oil galley. it works best on solid lifter blocks when running a solid roller.you probably could fab some kind of bracket to mount to a head bolt or two that would clear the intake to hold the bar down.
or drill and tap the front and rear bulkheads to hold in the bar.
for a street roller it's kinda silly to go to all of that trouble, and it not really for the long haul, more a racing thing...