Brien,
Just in case there's any doubt:
The smaller engines have side covers that are 4 1/4" tall.
The 292's are just a hair under 6".
No confusing the two.
The part about the low deck and tall deck engines I find confusing. Is that from "the book"? All you need to know is the motor mounts and fuel pumps are opposite on the 292's from the other motors.
When you try to put a 292 in a car and find the fuel pump is now sitting above the crossmember and the motor mount holes are out in space you'll have no doubts about what you're dealing with!
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Pete Geurds
64 Malibu SS
64 Chevelle 2dr wagon
64 Malibu 4 dr sedan