Interesting thoughts... I'm pretty sure I could disconnect the secondary linkage for a test run. Also, the last time I had the airhorn assembly removed, I thought the fuel level looked a little bit low in the bowls... a little more than half full. I guess I figured that the floats would displace a bit of fuel when assembled. I set the floats according to Edlebrock's recomendations, but I'll try raising them up 1/8" or so after I do the deactivated secondary test.

I had the other Edlebrock/Carter style carb before, the AFB 600cfm, and tinkered with it alot. But I never had to mess with the floats on that one

I'm sure there is no problem with the fuel pump. I've sat there and pumped all the gas out of the tank before I dropped the tank and fuel shot out pretty fast. The regulator is a no brainer to hook up. There is a choice of four ports around the side for input and output and the return comes out the bottom. It may be possible that my pressure guage is inaccurate and I'm starving the carb at the regulator because of an improper setting.

Thanks for your help. I'll try disconecting the secondaries. That should give a good benchmark to rule out other possibilities.