426 Hemi Crank Question

Hey guys I am looking at buying a 426 hemi from a guy for 8500. But He said that he put a 440 crank in it. Did the 426 hemi's have the same crank as a 440 just different rod length? Also he said the heads on it are new MP steel heads prepped by modern cylinder head. But he doesnt have the intake or carbs for the motor. Is it worth the money since it doesnt have original heads or crank. Also the date code on it is 1-26-70. Also the motor is .060 over. And if they didnt use the same crank any of you have a clue as to what size hemi he was heading for 472, 528, ect,?