Help me with this odd ball....

I know one thing, "back when." My 70 440-6 lost the no6 rod bearing at somewhere around 40--45K. Had the crank turned, and "they" talked me into hard chroming it, and rconning the rods. The no6 left town sometime later and took the rest of the engine with it. I unbolted the valve covers, the distributor, and the intake and threw the rest in the dumpster.

"Many" guys back then would say "number six?" like it was a common thing.