[ReMorton]

..I can't comment on the automatic choke issue, but I had a number of issues to resolve with SPO2089 after purchase. One was the hesitation on acceleration. I have the 393 crate/750 Holley like you. Basically a no mans land between 1000 and 1300 rpm. One session on the dyno indicated it was not the carb but the vacc advance. It was plugged and the dizzy was converted to full mech advance. Fixed 95% of problem. Next fix was throttle linkage. I adjusted it so that I had a bit more pedal movement from idle to normal operating. Problem's gone. Next step is to junk the Holley altogether.