My transmission was mounted in the factory spot with a regular old transmission mount.
If Mopar sold the engine mounts as a kit to install a big block on a V8 spool mount K-member it had to be in the correct position.
I can not possible understand why Jim Lusk thinks it is to far forward. Any further back and you might as well drill holes in the firewall to get the bellhousing bolts out. Since I just took it all apart and know how it fit I am going to say it's correct.
Tom