OK - I just referenced Fred Simmonds 1972 455 A-body paper, and on the 455HO is was nearly a dead heat for M22 / M40 usage.
Out of the total of 747 1972 455HO A-body cars, 365 were M22 cars and 382 were M40 cars.
I suspect that split would translate to the WW5 cars as well.
48.8% of 290 = 142 M22-equipped WW5 cars.
51.2% of 290 = 148 M40-equipped WW5 cars.
Who knows . . .
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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