heads up,
i cant believe you chucked the engine becuase the head bolts would loosen. did you try wrapping them in plumbers tape? did you try soaking the inside of the screw holes with rubbing alcohol and pouring it out and repeating and then draining it and using locktite? there were billions of things you could have done to keep thos bolts from coming loose and you simply throw the engine away? especially in your time of "tight budgets"?