Need advice about 727 transmission

Thanks TrailBeast,I appreciate the help and advice you and others here have given me. I wasn’t familiar with what exactly was missing or would have been changed to make the 727 work vs the original a904 as I don’t have a 360 car with 727. I’m assuming this car was originally a slant six because it was a stripper model but the seller didn’t know. He had an attitude and was kind of difficult to deal with.