Like Jerry stated, any universal carburetor is going to REQUIRE tuning.
Holley parts are reasonable in cost, and available in just about any FLAPS around the world (maybe because every Holley around the world needs parts
).
Weber parts, on the other hand, or neither reasonable in cost or readily available (at least here in central Missouri).
There are lots of books written on the tuning of Holley carbs. Determine the list number of your Holley, and then look up the type (probably 4150). Once you have determined the type, buy one of the books. Sit down one night, ignore the obnoxious soap operas on TV, and read the book cover to cover. The next night read it again for understanding. Now invite a friend over that is thoroughly versed in Holley, buy him dinner, and get him to help you tune your carb.
And before doing any of the above, check your ignition!!!!
Jon.
