If your short on cash - try changing the oil pump and rebuild the head first.
If the oil pressure comes up after changing the pump, then the bearing are serviceable - yes its extra work and it might cost you a head gasket if at the end you need to take the engine down completely.
Personally I prefer to rebuild the parts I have rather then replace the engine unless I'm doing a swap.
Because I have a 230ci in the back yard, I plan to rebuild it as a 250ci, so I need a crank. I'd hate to tear down a running and driving truck just to steal a crank. I'd also hate to try to swap engines in the yard. I have a garage and that's where I'll build the new engine, then drive the truck into the garage and swap.
