[watk69]

Proper Float adjustment is the best place to start. Again Eric gives a good primer on this and is great for getting it set up before you put it on the engine. Make sure every single orfice is blown out too. If only one of the myriad of holes has a blockage in it, it will not run for sh*t. Lastly after you've set all the screws by vacuum, let your ear be your guide. Set your timing and final screw adjustments where your engine is happy, not what its says on the shroud, it will let you know. My stock 69 Z/28 will not run worth a damn at plugged 4 degrees BTDC 900 rpm. YMMV