The 1978 323 manual did not
provide any information on the sling placement for those of us wanting to haul
our boats out with a travel lift or other such contraption. Subsequently, I
unearthed some drawings that Pearson created in 1980 that provides that
information. You can find that and other drawings in the
323 Manual Supplement.
The forward strap is easy to position as it will slide forward of the keel and settle onto the hull pretty much of it's own accord. The main thing to keep in mind is that you do not want to use your prop shaft to support over six tons of boat. To that end, make sure that the rear sling strap is run close to the end of the coachroof. It will naturally find its way to the correct position without any peril to the prop shaft.