Could just be carb issues too or a combination of that and gearing. Get an edelbrock owner's manual for your carb, and read through it. Seems like a 326 ought to be more than fine w/ a 3.23 if the carb is OK. Swap the acc pump link to the hole closest to the carb... should be in the center of 3 holes right now. This will give extra stoke/more fuel. If it makes any difference, swap it back and get the instruction manual.
