"Actually, that 140 box might well be beneficial for performance / economy. I suspect there's room for it in an Amazon's engine bay, too -- I think the last Amazons in 1970 used that box or something very similar, although that might be a mental hallucination on my part ("but I coulda sworn...")."


I've got one o' them (elusive three-bolt) black boxes in the wagon and am currently on the search for another for the sedan, I think Boris is sending me one-I really like it.
Now the box came out in '67 or '68 with the introduction of the three bolt SU's. In '69 SU went on strike and everyone started using Strombergs (and boxes that fit same). When SU was back in business, they (SU) introduced the HIF's (and black boxes to fit those), so the three-bolt black box is hard to find indeed.
I don't know all this as fact, it's just what I've gleaned.
Best, shayne