Andy Sheldon would be the man to ask, and he sometimes posts here.
I assume you mean a FE big block since those seem to be of the most interest to Ford GT40/Cobra folks. I was thinking that Jerry Jansing, the former Roaring Forties agent, had doen up a RF chassis for a FE motor. The RF chassis and the Tornado chassis are very similar upon visual inspection. Jerry is "jercarnut" on this forum and sometimes reads and posts.
I don't know if CAV has done a FE installation, but I thought I'd see one running around somewhere. Lots of CAV folks around on the forum. Superformance will undoubtedly be doing FE installs in their replicas but aren't really represented strongly on the forum because they haven't delivered users cars yet, but are about to. Fran Hall at RCR I think can handle a FE, but you can email him or search around on the forum to check, he posts frequently. ERA has done FE installs for sure.
So, while I'm not sure if someone has done one in a Tornado, they have been done. And, if done elsewhere that suggests to me you can stuff one in a Tornado too!
Ron