Looking at picking up the 24x coil per cylinder conversion for this tank. I have a spare set of low mileage D585 style truck coils with the external heatsinks. I also have a spare 2003 Express van 6.0L harness to rob the coil wiring out of. Word on the street is the D585s give out 3x more spark energy than even the LS1 coils do and have dyno'd up to 10 hp over the LS1 stock coils no less the old L31s single coil distributer setup. I cannot wait to twist this thing to 6,000 rpm with great spark energy. I have seen claims of 20+ hp on a LT1 with the same setup.