Almost seems like a /6 is a good candidate for big sleeves maybe a 4 inch bore and a deep fill of hard blok, I'm not sure I've never had one on the boring bar yet, so if it's even possible I'm sure someone would have done it
Not enough engine there. @805moparkid and I have researched it pretty well. We had hoped early hemi heads were close with the bore centers and head bolt pattern. Nope.