Re: 5.7L vs 4.7L
I believe the 5.7 WK's do have 3.73 gears. I could see where a good running 4.7 WJ (probably lighter) could hang with a ~5000+ lb. (w/driver) 5.7 WK for a bit, but probably not the whole 1/4 mile, if that's what they were racing. The 1/8 mile may be a little closer.
05 LX/RT and 06 WK/GCO, (modded similarly) with MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tubular headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 spark plug gap.