This carb was just rebuilt & it has sloppy shafts WTF, When i was rebuilding holleys i always re-did the shafts with new bushings, with those loose shafts, you'll never get that carb tuned in "right", you may get by, but it won't be right, plus it'll always stay out of adj., At this point, i would just get a Billet base & be done, there set up for 4 corner, there nice, & it won't have holes drilled in the blades.
Heres one.
http://cgi.ebay.com/ebaymotors/HOLL...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories