Was driving back home on the boat and there was smoke from the engine compartment and out of the transom. Have a chevy 5.7 with a mercruiser aplha 1. I think the boat is and 03 22' Tahoe. The engine would start and run intermittently but does not engage into gear, just dies. The engine looks good, no oil leaks, sounds ok compression wise may have blown the outdrive not sure how to check to be sure if it is blown for sure though or where to find one to replace?