1970 340 engine w X heads

Are you sure on the vin #, 1 being year 1971, E there is no E probably a B for barracuda, then the 6 digit sequence # what is the casting date? probably early to mid 1970. I have a 71 block vin# 1B391422 casting date is 7-1-70 It could be for sale if some one needs it.