Might be worth posting something on the RFS forum.
Its not a high volume of activity there, but higher than normal percentage 'collect' interesting things like that.

In fact there's a couple of threads there about the Carb Shop and Rapidjet blocks. BLP made a version very recently. Troy Patterson was always promoting the Weber version, although I hate suggesting contacting him.
Before doing that, see if with some collective knowledge, we can determine which if any of the metering tube/jet holders interchange.

Mark and a couple of others also have some insight into their pecularieties during high flow. I think they are pretty neat idea, and the carb shop's version was close to the same thickness as an original Holley block. Pretty slick IMO.