Not something you see very often. Thank you for showing us your setup. V8's aren't always necessary for the old trucks to stay up with traffic.
My ride would struggle at 45 mph and then I installed a gearvendors unit in it....could not find a 50s era rearend that had the high-low option, so that is what I did. Now it rolls comfortably and once the blower is done, I will install the eight lug disc brake set up that I just got in.