Brendan - Not to open a can of worms here, but the answer is basically whatever you're willing to pay (or whoever may be the prospective buyer). Here's a related topic
Tech Tip that provides details and previous "Stovebolt" wisdom that you can apply to your question.
BTW - Here's the link to the
original ad for the 1940 GMC. Several more pictures in the full ad as well as the asking price from the seller.
