It looks like H is not always 2.0L Turbo Sunbird as its also used on VP V6 here according to Dick's records.
A is for 2.8L 60 deg V6
B is for 2.0L Turbo Sunbird
C is for 2.3L Quad 4
F is for 5.0L Holden V8
G is for 3.8 Buick V6
H is for 2.0L Turbo Sunbird
J is for 3.1L 60 deg V6, both NA and Turbo
K is for 3.3L Olds V6
R is for 5.7L TPI
V is for 3800 Buick V6
*or*
05 is for 3.3L V6 Olds
09 is for 3.1L V6
14 is for 4.3L V6 (Turbo)
19 is for 4.3L 90 deg V6
35 is for 3100 V6
36 is for 3.4L 60 deg DOHC V6