My first bit of feedback would be to make a proper introduction... your first post talking about a ginormous V8 swap and a "gay ass flame war" probably isnt the right first step. You have first hand knowledge of people trying to fit large engines into 510s and failing.
Who are you? What tools do you have? Whats your experience? How deep are your pockets?
Theres the old adage that anything can be done with time and money, but there comes a point where its not even worth it anymore. I highly doubt there would be enough room to fit that large of a V8. Most V8s in 510s are small blocks...
I would suggest fixing the tunnel and just putting the SR in it if youre dead set on a swap. By the time you fix the damage from the cutting, buy a VK, make all the custom one-off bracketry, you could be driving a completed and built SR 510. Not a years long $20K VK paper weight.