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The great Bill Walsh, on how he evaluated each position: First up, offense -
CENTER
Ideal size: 6-2, 290
GUARD
Ideal size: 6-3, 300
OFFENSIVE TACKLE
Ideal size: 6-4, 310
TIGHT END
Ideal size: 6-41/2, 245
WIDE RECEIVER
Ideal size: 6-3, 210
QUARTERBACK
Ideal size: 6-3, 210
FULLBACK
Ideal size: 6-1, 245
HALFBACK
Ideal size: Large enough to take punishment.