Always remember, the converter needs to be able to spin with the bellhousing bolts tight!! It’s ok if there is a little drag, or the converter mounting tabs lightly hit balance weights. If the converter is pinch tight, you WILL tear up the pump, converter, the transmission, or the engine thrust bearing, possibly all at the same time. And there needs to be a little clearance between the flywheel and converter mounting tabs. If not, same possible damage. Converters “grow” dimensionally from the pilot (the part that “pilots” into the back of the crankshaft”) and the front of the converter pump (the part that slips inside the transmission). If there is no clearance, when the converter grows under heavy load, it will put a bunch of force on the crank and transmission. It’s basically trying to push the engine and transmission apart. Something has to give. Normally, the flex plate “flexes”. If it forces enough to bottom out the pilot on the crank, it will tear up the engine thrust bearing.