So I did a ****-ton of thinking an measuring and some drinking last night, and now I'm laying under my truck as I'm pulling the transmission and you are right. The stock crossmember and mount will push the trans to far up towards the floor of the truck... ugh so I start searching for a local holley swap mount for the 46rh/re and I fumble across this vid and after some thought I've decided to make this modification. So we'll see...
@the 5:30 mark he start talking about his setup.