To get a 540" from a 440", you will need a 4.5" stroke crank and 4.375" bore. It can DEFINITELY be done to a stock block, as I have done it. The pan rails need to be notched for rod clearance and the camshaft can not have a higher lift than .590" or the lobes will contact the rods!!!
My engine had a .555" roller cam and propelled the Cuda to a best of 9.69 in the 1/4 on 100LL avgas. The Cuda was 3600#'s, full interior, leaf springs and a snubber. The 540" motor will make GOBS of torque.
If you would like to see what my engine had in it, the guy I sold it to is selling it on Moparts and you can read the description. He never used it and it is in the exact condition I sold it to him.
