I've never been sure which block codes got which distributor in the 72 HO cars, so I just did some research. I found the following information in Rocky Rotella's new book, "The Definitive Firebird & Trans Am Guide: 1970 1/2-1981", (page 71) which, states:
Code / Transmission
YB / Automatic with K65 Unitized Ignition
WM / Manual with K65 Unitized Ignition
YE / Automatic with points-type ignition
WD / Manual with points-type ignition
I found another source (online) which gave the same info. It's the "Original Firebird and Trans Am 1967-2002...The Restorers Guild" by Jim Schild (page 72).
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