ok im kinda stumped here I just picked up a tci flexplate that has 164 tooth count for my 87 bronco that has a 74 351w engine in it but the flexplate is a 50 oz imbalance now if im correct are the 74 engines all using the 28oz imbalance not the 50 oz? also the factory flexplate in it had c6 stamped on it no numbers im guessing that it has a c6 transmission in it? also this flexplate I got from tci the 29.1 has AOD stamped on it?