The engine has been run with a 50/50 mix is
antifreeze and water all its life . The engine was out of a running boat . I would think a 60ies era criss craft with twin 427s .When the guy is back from his trip ( vacation) I will see if he is receptive to a inspection by a shop , He sold one last year , my guess this one is reverse rotation .
I think if the boar is 423 , it may make a goog build . I still would like to know the most likly spots for stress cracks . I would pull it apart right on the spot and have a look . He may need to know what he has anyway , if its good he has a deal . He asked $1500 for it .