[mreid]

All three are good choices, but the order depends on what you want to do with it. If racing is your number 1 priority, then Factory Five would be the best of these three. If originality of body, then Unique. Personally, I like Unique or FFR in that order, but Unique is probably the better choice for a 351C build. You can make either work, though.

Good luck and let us know what you decide to do and how you are progressing!