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Remove the bell housing bolts and separate the transmission from the engine, leaving the torque converter attached to the flexplate. Just be careful that you don't bind the turbine and stator shafts while you slide the transmission backward. You can remove the torque converter from the flexplate afterward.
Just take it apart piece by piece, don't worry about getting it to turn over. Have the Crank measured for wear and go from there. Can't comment on heads, haven't been in the Big Block world for about 20 years...
Don't I have to know the bore size of the actual motor or could I go off the standard bore size of a motor bored .030 over?
It could be a good idea to wait to order pistons until you know the condition of the block. If you, say order 0.030" over pistons and the machinist tells you that you need to go 0.040" over...well then you are stuck with returning pistons and ordering new ones.The machinist will bore the cylinders over to what pistons you have. Cast, Hypereutectic, or Forged. Each have slightly different finished bore sizes and the pistons will come with recommendations. The machinist will also want to measure the pistons and not just rely on spec. sheet details.The vast majority of pistons are either 0.030" over or 0.060" over.