Transmission adapter to mate a slant six to a smallbock trans

Due to the thickness of the adapter, wouldn't you run into problems in trying to bolt down the transmission into the rear crossmember with now everything being longer?
Was there a different transmission mount also for that set up?
I always wondered about everything working, linkage, mounts, stuff like that.?

Remember that when the adapter was designed it was for the A100 series which did not use a regular transmission mount (installed under the transmission) but used a transmission that had a boss on top of the case to support the transmission from above. Kickdown linkage was also designed somewhat different than from the cars. Adapting to a car is not really a problem and has been done quite a few times.