Al, if it's not a race application that requires very high flow, is there a reason to use a high pressure pump? It's hard to imagine 80 gallons of liquid passing through the jets of a single 1406 in an hour. I use an auto parts store stock replacement pump, but my roadster is a street only vehicle. That same pump may be completely inadequate in a race application.
I have found the 1406 a very easy carburetor to tune. Changing jets requires disassembly but changing the metering rods and/or metering rod springs is a 5 minute job.
My son's '78 El Camino has a Quadrajet and changing jets or rods on that takes a lot longer. On the plus side, his El Camino has fabulus throttle response because of those tiny primaries even with a moderate Comp Cam and gets 19 MPG at 70 MPH on the highway and my much smaller and lighter roadster with a similar Chevy 350 engine gets 20 MPG at 70 MPG but a 2004R overdrive transmission is required to accomplish that. The El camino has the original Sagnaw 4-speed.
