I did manage to get these with mymopar.com, nicksgarage.com and Hamtramck-Historical.com:
E85= 440 cid 4 barrel V8 (230hp)
D34= Torque Flight automatic transmission
Y= Imperial
M= medium price class (therefore a LeBaron, though that is obvious post-70)
43= 4-door hardtop
T= see E85
4= 1974
C=...