93 Mustang 351w C4 Swap Help!

If you have all the parts, can you just mock it up?
That is how most swaps are done... Take what you got and see if it fits.
You are way ahead of the curve since you know everything fits with the possible exception of your headers.
Probably don't even need to mock it up in the car.... Just bolt on the headers and bellhousing. If the headers clear the bell, you're good.

If you are worried about floorpan to bell clearance, the more appropriate question would be "Has anyone run a 164t bellhousing in a Fox?"
The C4 part is immaterial. 164t flywheels/flexplates on any transmission are going to take up the same space in relation to the body.
I can't imagine the body will be the issue. The headers are much more likely.

All those parts should fit in a Fox...

I had 90 GT that had an AOD it used a 164 tooth flywheel stock. I pulled the AOD and put in a C4 and had to use 157 tooth flywheel. I cant remember exactly why though because that was like 10 years ago.