Questions about DIS-4 and Accel CoilPacks

[98SteedaGT]

I have a 98 Steeda Replica w/ 4.6 SOHC Engine. I currently have the following mods: 70MM TB, JetChip, BBK H-Pipe, 2Chamber Flows, Cervini Functional RamAir Hood, 3.73 w/rebuilt Ford Posi, and Alum SVO Stud Girdle;Steeda 4130 Moly Sub Frames, Front and Rear Tube Sway Bars, Tokico Shocks, Struts and Quads. About to add the G-Trac bar and 4130 Strut-Tower Brace

I was reading the info on the DIS-4 and the Accel Coil Packs, does anyone know how much of a difference it would make to my engine. I have a new engine with 20K mi on it now. I don't want to waste 500.00 on this stuff if it won't do anything. I am also planning on overhauling my AODE with new internals and a diff Stall Converter.. please no comments about going to 5-Speed, as I am staying auto. Thanks.