I was with MOPAR back then
we were loosing thrusts- warranties
always use larger dia thrust if block is machined or if line boring your can machine
always check cranks for chewed up thrusts
I drill through the thrust bearing face into the oil feed ( and drill and reamwith about a .040 then drill the bearing face with larger and chamfer
I also chamfer the parting lines toward the rear
anything you can do to get oil to the thrust face, especially with a strong clutch
the crank works but do not use later bearings in early block without machining register
