Geoffrey:
"I recall reading that using true black and white film and processing as such will give better subtle contrast and reveal contour" Correct, but we don't know for sure, or do we, if Jason used B&W film, your the photographer, you tell us.
"When you convert a color image into black and white you actually lose some contrast." Also correct
Tom
For obvious reasons, much is a matter of opinion and ones eye as it sees the image and the ability to render the subtlities.
"you just tend to look at it more in the black & white because you are less distracted by the rest of the frame."
My point exactly about being more objective without getting overwhelmed by the setting and surrounding context. Looking at a photograph is quite different than actually being there...the distractions and all, so if given the choice, B&W photos are for me more effective than color.
Question, would you prefer to look at old color photos (regardless if they were available or not) of work you are doing for restoration, or do you think the typical B&W photos of holes and aerials are more effective for this purpose?