[Chevelle-List] Holley Carb Question

[Craig & Cerena Robertson]

While my 396 engine is beening put together I need to start looking for a replacement Carb.  I was given a Hollley 600 carb with the car but that will be to small.      My 396 is bored out .40 and I have installed a Crank from a 427.  I am told that I should go with a 750 Double Pumper.  Not having much knowledge about this, and not being able to afford a new carb, when purchasing a used Holley what do I need to look for, so that I don't get ripped off.      When people talk about carbs they talk about them being modified, or being mechanical  and about secondaries etc.  I have no idea what their talking about. What do I need to purchase, (knowing that the Carb will need rebuilt.)  I am not using my SS for racing, only crusing with a good sound.  Thanks     Craig