Doing a tie across the middle might be a good thing also, but really I don't know that I could make one that looked okay and actually fit, lots under the hood with A/C and EFI.
Former FBBO member "Darius" had a sturdy looking triangulated brace for his 70 GTX that he couldn't get to fit due to the 5.7 Hemi engine cover that he preferred to leave in place.