Yes Larry... I thought about what might move at the front of the engine. I'll put an extension and breaker bar on those manafold bolts to see what kind of resistance they give me. I see that they are extra heavy duty so I do not expect them to snap.
The flex disk arrived today so It looks like I have everything to do the job over the weekend.
Thanks to everyone who gave me input on this job. I now feel like an authority. Started out with a big question mark.