440 Engine Guru's Help

UPDATE
Finally got some time to try what we have been discussing , pulled plugs looked a tiny bit lean no damage all looked about the same , pumped all the fuel out of it , thru some 110 race fuel in it and bam fired up and responded way better , idled better , smelt better actually wanted to run , but noticed right off the bat there was a little knock / rattle coming from the front plus oil pressure was about 20psi idling , brought the rpms up about 1000 more just to check pressure did not rise at all , let off and it rattled more , shut it down at that point / ugh crap , come to the conclusion that they where trying to drive it on pump gas and that it had been pre detonating the whole time , this would ex plane the vibration , the missing , and the bottom end going out with oil pressure dropping , Cant really blame the guy I got it from he had no clue and was not a car guy at all , I got a great deal on the car even with the motor bad LOL , My only hope is that the 440 block can take this abuse and there is not enough damage to the block so i can give it the loving that it needs , Anyway motors coming out , Thanks to all that helped with advice .