wowsers many questions
18r will be an upgrade over the 12r.. cubic inches increase is always going to help!
the 18r and 18rc are much the same engine, though the c means its the pollution spec, which might make it more legal for your car theoretically, but slightly more asthmatic. i would use what ever engine you have available that is in the best condition.
I understand the 12r and 18r blocks are related so you should have no trouble bolting up your column shift gearbox.
No idea if there is a 4 speed auto that bolts up.
The other option would be to source an 18rg - they can really get up and boogey. Not necessarily huge torque monsters, so perhaps not so good for a farm hack.
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