just got a mostly original down to the key 1965 scout (4cyl) it ran when i bought it but now i'm having a issue. It turns over strong and has fire going to all four plugs and they are clean (NOW) and not fowled. when i crank it the other day it began to spit a water maybe oil mix from the passenger side of the engine. before i could get to that side to see, the engine died. i looked at the valve cover bolts and several in that area were loose so they were tightened. does any one have any idea what could be wrong ? could it be that the loose valve cover destroyed the plugs or just let alot of oil in there causing it to not fire?