I was told many many yrs ago that a local speed shop used to sell Chevy head bolts for the Kent motor...apparently they are the same thread and length .
Also when I used to build them is cheap out and re-use the old head bolts and never had problems . I've always cleaned them up before use and cleaned the threads in the block , also put a drop of oil under the bolt head....this will help give a better torque reading when tightening them up.