The rockers in the pic are the correct ones.... they are 440-1 big block exhaust rockers. There should not be a 3/8" gap between the rocker body & the hold down, I think you're missing some spacers. In that pic, I don't see what would be preventing the pushrod from going closer to the rocker adjuster, looks like it should have a fairly straight shot up through there to the adjuster, I'm guessing it is hitting the pushrods hole where it should be with a tall seat lifter which is not side to side clearance issue, it's fore/aft clearance. (intake face of head to exhaust side of head direction) & Yes as said before anyone who has ever tried to run the +400" taller hyd rollers with ANY type of LA head has to clearance the pushrod holes in the intake face/exhaust flange face direction.
