For '81-'86 only, the 8th character in the VIN will be.....
3 = 3.8L V6 ('83-'86)
A = 2.3L (also 2.3L turbo in '80)
B = 3.3L I6 ('81-'82)
D = 4.2L V8 ('81-'82)
F = 5.0L V8 ('82-'83)
M = 5.0L V8 ('84-'86)
T = 2.3 turbo ('81-'82 in Canada, '84-'86 SVO)
W = 2.3 turbo ('83-'84 Turbo GT/Turbo RS)
For '87-'93 only, the 8th character in the VIN will be.....
A = 2.3L ('87-'90)
E = 5.0L (non-Cobra)
D = 5.0L Cobra
M = 2.3L ('91-93)