#5, 6B will be nearly identical but 5 gets the nod. Scrap the 1.60 you got from Andy for the test.
I had been thinking along the same carbs to test (the QFT 1.52 downleg & the QFT 1.59 annular) along w/ the baseline BG.
The Holley 1.60 annular conversion is sitting on a stand ready to bolt on (except I did notice the linkage is binding for some reason). No reason not to at least throw it on to see how it does... time permitting.
And the Race Q1000 down leg should be a 1.500 venturi, that might be an interesting test against the 1.59 annular.
That's what I expected, too (i.e., 1.50" venturi). However, I measured mine after you installed the BLP boosters and found it measured 1.52", and later on found a QFT spec sheet that listed the RQ-1000 as 1.52", also. It makes sense, considering their venturi increases from "950" to "1000" is .07", and from "1000" to "1050" is another .07".
