Those are not them... The give away is they don't have a double arm that attaches where the motor bolts up.. Those may be 71 B body....

FWIW I can't verify the accuracy of this list but someone posted it years ago & I saved it...

1970 B-body ft. - 2999682/3
1970 E-body ft. - 3548530/1
1970 B-body quarter hardtop 2583764/5
1970 B-body quarter conv. 2583854/5
1970 E-body quarter hardtop 3454108/9
1970 E-body quarter Conv - 3508210/1
1970 C-body ft 2945996/7
1970 C-body Quarter hardtop + conv. 2945560/1
1971 B-body door - 3548750/1
1971 B-body Quarter - 3548610/1

"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."