Bellhousing alignment
I am not sure of your car and year, but for example: Per the 1970 Plymouth service manual, bellhousing bore runout relative to crankshaft should be within 0.008" total indicator reading. Meaning the bellhousing bore center should be within 0.004" of crankshaft center. The bellhousing face should be with 0.006" total indicator reading of the crank (and flywheel).