Sniper on a big block stroker

He doesn't tell you how to change the AE curve. He just sells you the linkage and then you're on your own.

The problem is that the Sniper AE (accelerator pump for you carb guys) is designed to squirt fuel in as all four throttle blades open. When you switch to progressive the fronts open up and then at about 35% TPS the rears open more rapidly. So at 35% TPS you need a bunch of AE.

If you really want to pursue the progressive linkage then you should at least start by studying the AE curves that a progressive linkage TBI setup uses. Start with the Terminator and maybe try one of those. It will look like a shark fin. If none of this makes any sense to you then you might not want to mess with it.