Just occurred to me that my seal retainers will have to be screwed fast after the crank is in place, leaving no room for an allen wrench between the block and flywheel flange.
I'll have to make sure the screws for the retainers line up with the flywheel bolt holes well enough to get the screws in through the flywheel flange.
I was wondering about being able to put the seal retainers in place before the crank is set in place and the cap installed, but you'd have to be able to be sure the seal settled into place between the retainer and recess in the block/cap. But accessing the screws thru the bolt holes in the flywheel flange should work well. Just a bit fiddly. Maybe loosely install the seals and screws before the crank, then tighten the screws thru the flywheel bolt holes.