Ok, I dont know much about carbs so figure what the heck might as well learn something right. Anyway... 1.)What is different in a double pumper and say a regular 4 barrel? 2.)Mechanical vs Vacuum secondaries...I assume with vacuum it waits till the engine is needing the fuel to open the secondaries, whereas with mechanical, they open when you put it on the floor? correct? 3.)Does the carb (ok now this sounds REALLY newbish) just more or less drip the fuel down the bore and let it mix with the air or what? I know FI it sprays fuel and it comes out of the injector pre-atomized. Never really wrenched on a carb so dont know. Ok, theres the extreme newb questions, but since at the moment it appears i may (if no one will burn a chip at a reasonable price [$800 isnt reasonable]) end up carbing the 496. We'll see and thanks for the answers.