Well, just following up... was never able to get a bolt in.. appears the head sheared off! Made it home driving 40 mPH or less and checking the balancer at every opportunity... Got her on the lift and the crank shaft, where the keyslot fits, is completely sheared off. Looks like the engine needs to be pulled and the crank replaced. Since I do not have the facility to do it, got a couple of estimates to R/R the engine and rebuild as necessary and it's almost as expensive as putting a new 350 in! Jegs has them priced between 1500 and 2000 for the 260 hp and 290 hp versions. With the 36month/100mile warranty, looks like she will be getting a new engine beginning of 2013~!