I have the 80533 1250, factory jetting is 97 for yours and mine and you should run 99 in back if you are lean. It may be a manifold distribution issue. You will jet according to carb size usually. The old 9375 is the best 3-circuit from Holley as far as metering and 93's are OK, but there are things you can do to the 1250 to help. Take out the intermediate bleeds (center ones) and put around .025 in the main air bleeds as well as jet it up. This will help an excessively rich bottom and midrange that is typical on 3-circuits. Invest in an AFR meter, dual O2 is best. I have a FAST but wish I had spent the extra for the Innovate system. If you find you are still lean up top, and good reading anyway, read the following. Mine has been converted to 2-circuit.
http://speedtalk.com/forum/viewtopic.php?t=9934
http://www.motorsportsvillage.com/fo...pic.php?t=3742
http://www.motorsportsvillage.com/fo...pic.php?t=3811