I would say this will cool your V6, it's rated up to a small V8 for cooling capacity. It's not a Be Cool unit, it's from an Aussie company we're getting several products from. I'd been working with them for about a year on this and they finally got them into the US.
As for the "threaded bung", just think how popular you would be in prison with a bung that can easily have something screwed into it
allisonsautomotive.com gear reduction starters for the 124, 131, X1/9, 850 Distributorless ignitions for 124, 131, X 1/9, Monza wheels
X1/9, 131, 124 Spider exhaust system, http://firstname.lastname@example.org