If you are able to remove the Oil Pan and have room to get at the Rods and Mains it is not hard to roll in new Bearings.
If you to to the Library and they have some old Motors or Simlar Manuals it may have some hints on roling new Bearings as that was more common back before 1975 then it is now a days.
It also used to be done frequently on Big Trucks and other equipment were making Money meant keeping the Vehicle on the move.
No need to remove the Head as long as it is the lower Rod Bearings.
On a lot of Engines the castings below the Piston prevent you from pulling the Piston out from below and in fact on some they will pull out fare enough for some rings to pop out but the Piston will not have enough room to come out completely and you are sort of locked in Place and it takes some carful manipulation safely stuff/compress the Rings back in and and get the Pisto in.
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84 300D, 82 Volvo 244Gl Diesel
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