Long tube headers vs Block Hugger (short) Headers 273 Small Block

Any one have an experience with both? these will be going on a 273 with a 500 Cfm edelbrock. Would the Short tube headers be better for my application or would the long tube Horsepower Gains?
Show us some samples of what you're talking about. Block huggers don't work on early A's unless you have a trick up your sleeve.