[jmar]

putting dowel pins is a lot of work and expensive and difficult to do

An idea of a cheap alternative might to put the dana 80 girdle on, get all the bolts tight, install the bearing cap tensioners, then take a 1/4" drill bit or whatever size you so desire and drill through the girdle and into the housing then run a die through and put a bolt in, make sure there is nothing you will damage before you drill and put a extra bolt on both sides of the girdle
this should eliminate any housing spreading and will not require a machine shop either