My builder installed the TrickFlow girdle when he put my stroker together... the installation instructions are below - can't say whether the torque specs would be the same for a Ford girdle.
We never really discussed the benefits of installing one, and he also filled the bottom of the block's water passages with some type of iron/epoxy mix. I think he was concerned that the 347 stroker needed as much added strength as possible to keep from busting apart.
http://static.summitracing.com/globa...s-51500700.pdf
- Dan