Probably because those aren't exactly the chords that he is hearing--f you followed our discussion, Armen started out with what you have, except that he is in the key of A, and that, as he outlined, the correct chords move from the B7 to an Em(twice, actually) then to an A7, but the bass walks up, and he wants to get that sound--which you can do as I pointed out thanks for posting the all the lyrics and all the chords, though- The 1946 recording uses different chords than you have in the line "From Head to toe she's a perfect size"--which goes:

|GG/GG/A7A7/A7A7/
D7D7/D7D7/D7C#7-C7/B7B7/
or,as you had shown it, with words:,
From (G) head to foot she's perfect size -
(A7) she's a whiz,
(D7) Always wears her forty-five -
(D7) gun (C#7-C7) that (B7) is,
(E7) She's got the look that's so impressin',
(A7) She's got the pause that's so refres in',
So (G) Round, So Firm, So Fully Packed--