I WAS TOLD THE HEADS WERE FOR A 67 CHEVELLE 396.

BUT THE CASTING # ARE 3856206 BUILT IN JUNE AND JULY OF 1965 ANY IDEA WHAT THEY ARE FOR? I DO NOT HAVE THE BLOCK TO GO WITH THESE HEADS.

1965 low horsepower passenger car [impala biscayne etc ]396 cu in ..could also been used on very early production 66 but only first few weeks

THANKS FOR INFOMATION