Keep asking till you get someone to agree with you. Why even ask then?
New motors don't just fill the cylinder with water. Slam it back together with a quick head gasket & you're likely to hydro lock the motor & ruin it completely. Better figure out what's going on, then decide what to do.
Running stock 40 year old head bolts? Only torqued initially? Heads & deck both surfaced? Head gaskets over hanging bore? All those things would require both heads at least to be pulled.
