can I see the transmission Mounts you are using on your ebodies?
I plan on notching the trans webbing a little to clear TB mount cross over

I've done this swap on my 340 Cuda. I believe you're talking about the transmission cross member, right? If so, I know of 3 options for you:
1) Fontana Motorsports. Look him up on Facebook. His cross member is around $350.
2) US Car Tool. Show an A-body cross member on their website, but have heard that they also sell a kit for around $250.
3) DIY by either modifying the stock cross member or making one from scratch. That's they way I did it, but be aware that you need metalworking tools and a good welder.
Hope this helps.

I used the Fontana mount and cannot recommend it. It's just too light duty and locates the mount forward of the cross member which allows the mount to flex downward. That tranny is heavy and unless the rubber mount is located directly under the cross member, the resulting leverage puts a huge twisting strain on the cross member.

In my opinion, the tranny mount itself needs to be directly under the cross member.

Does somebody make a mount like that?

i called UScar tool today, they do in fact make a mount for an E-BODY...
they are updating their site to show it now. i ordered one, as soon as i get it i will post pics, and give my opinion on it. UScar TOOL makes some quality stuff from my experience..we'll see

I also used the Fontana mount, surprised to read your concerns.
Mine is 3/16" steel and not going anywhere.
The position of the mount is dictated by the transmission, no other option to move it under the cross member, unless you move the entire motor back?
Only gripe if I had 1, $350 is a little steep for what it is.

There are 3 bolt holes under the tail shaft. A simple plate made to bolt to those 3 holes would allow the actual rubber mount to be positioned directly under the cross member. Just like the factory.