340 Static Compression Numbers and Test Procedure

No flywheel as this an automatic. But what I am trying to convey is that this is a 1973 vintage engine and I am guessing (I onow I could be wrong) that the crank is original and is cast ie externally balanced as that was stock for 72 and 73. I know there is a flexplate in there thats for an internally balanced motor. This will need to change if my hunch is correct.
Is there a weight on the torque converter?