[GTO-relic]

and one more thing...the throttle blades should be in line with the steel plate baffle, so the air flows staight over both smoothly, not offset from each other. otherwise that too creates turbulence. the correct setting should look something like this, and beyond that, it's not gaining anything..

this one I drilled bypass air holes to .193" , 73 jets, no metering rods, because the cam is huge,
and he's already having an issue with another Qjet carb he paid good money for from a well know Qjet building shop, we've all heard of...
that one is not idling the big cam correctly. his existing carb has primary nozzle drizzle and smoking out the exhaust too rich.
this one I opened up idle tubes to .043" and the idle down channels are .055" stock form leaving them alone- on the Buick 800 center.
FWIW the idle tubes can be drilled wide open to .068" and the down channel will become the restriction, being it's smaller.
I've done it before and it idled at 1000rpm in park, and 800rpm in drive TH350, with a 250 @ .050" solid flat tappet cam, on my own car 20 years ago.
that also was a Buick 800 center section, with Pontiac top.
the Buick 800 centers have smaller air bleeds, so they are richer.