If someone stumbles on this post and is working on their unmolested '68 340 barracuda with a 727 TF trans, (rebuilding the trans/changing the trans mount)
What type of trans mount is on your car?
If you would post pictures and/or a factory diagram of some sort. It would be interesting to see if the trans case, (mount area) is different.
It may save someone the head-ache of ordering the wrong trans mount, etc. (or not, Ha)