Ok that's great then! I would recommend a custom tunnel cap and crossmember similar to what Stielow or DSE is doing. I say this because to obtain the proper driveline angle your really going to have to tuck the transmission into the tunnel and I can't see a all for one cap truly being the solution.
Just FYI I purchased an off the shelve crossmember and ended up with 8 degrees of angle even when fully adjusted. We had to scrap that and make our own to get the needed 1 to 3 degree ratio we wanted.
I feel that because there are so many variations of engine mount set ups a lot of companies don't want to make crossmembers because there is too much variables in the mounts.
Here's our tunnel cut with a f body style trans mounted on a DSE subframe with DSE set back engine mounts:
https://www.flickr.com/gp/48011683@N07/Y83ii2
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