Lolol Yeah, I know, but I'd love to see it in there. lolol I'm doing the same, into a '69 fastback. I've had a couple of Gen3s mocked up in mine (I kept upgrading before ever getting the car running) so I know my Hellcrate will slide right in. However, there will be a slight problem with the intercooler water manifold on the back of the SC. You can modify your firewall or, there are a couple of aftermarket alternatives available. I bought one of the aftermarket ones that looks like it will work fine.
I had already spent a lot of time cleaning up my fire wall for the previous Gen3s and I don't want to do any more work to it for the stock water manifold.