damaged cases at base gasket , could this be the cause

hi guys u may have read my last post i strightend the crank this time using a ruler and a level , and got it millimeter perfect STILL WONT RUN one thing i noticed was there was damage to the cases where the base gasket sits there is an indentation about a mill or 2 down the base gasket is also split here i turned the base gasket upside down so it was a full bit of gasket over the dent but even tight there would still be a gap , WHAT CAN I DO !!!