List of engine number, type and data(displacement, cyl.-dia. etc)

hi, iam just building up a 850 limo and had trouble with a broken valve spring. I found a junk yard with 7 different engine's, all having the
wbc casted in but different numbers like 100g, 100gb, 100gf etc. Knowing the 850 engine is turning the "wrong" way i looking for a definition list of the ~900cc engine family. does anybody has an idea?
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