I use Sultans of Spark (SOS) coils on mine. They allow for a .060-.065 in. spark plug gaps. I looked at the MSD's, but couldn't find anything about the ability to open the plug gaps, which was important to me. On mine, I definitely noticed an even smoother and stable (little RPM movement) idle than I had before. I'll be doing the same to my Hemi Magnum as soon as I can find some valve covers and harness coil plugs. It has the same cam as the WK and has a little lope and roughness at idle. Not nearly as smooth and stable as the WK.
Let us know how they work out for you.
06 GCO, Dk Khaki, QDII, Tint Ft & WS Visor, Flshing Hi 3rd Bk Lt, MDS "ON" Lt, Airtab Vortex Gens, Cbn Fltr, Debadged, Fumoto Drain Valve, BT Catch Can, Chop EGR Tube, SRT-8 CAI, K & N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tune App, DS Tuner, Cust tubular hdrs w/3 in Magnaflow/Xlerator AP Exh Sys, Bilsteins, SRT Springs/Sways, Cust Eng Cvr, SRT8 frt/rear bumpers, FRI Sidewinder Cam/6.1 valvetrain, SLP 25% UD Pulley, BBK true 90mm T-Body, SOS Ign Coils w/.060 spark plug gaps, SRT Rep. wheels.